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81542248152 = 2335367939437
BaseRepresentation
bin100101111110001001…
…0111111011011011000
321210110211010101201220
41023330102333123120
52313444303420102
6101243205212040
75614456446621
oct1137422773330
9253424111656
1081542248152
1131644522a32
1213978401020
1378c67c9ca1
143d37918a48
1521c3ab11bc
hex12fc4bf6d8

81542248152 has 64 divisors (see below), whose sum is σ = 207754541280. Its totient is φ = 26661153792.

The previous prime is 81542248097. The next prime is 81542248153. The reversal of 81542248152 is 25184224518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81542248153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8635978 + ... + 8645414.

Almost surely, 281542248152 is an apocalyptic number.

It is an amenable number.

81542248152 is an abundant number, since it is smaller than the sum of its proper divisors (126212293128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81542248152 is a wasteful number, since it uses less digits than its factorization.

81542248152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16292 (or 16288 counting only the distinct ones).

The product of its digits is 204800, while the sum is 42.

The spelling of 81542248152 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred fifty-two".

Divisors: 1 2 3 4 6 8 12 24 53 106 159 212 318 424 636 1272 6793 9437 13586 18874 20379 27172 28311 37748 40758 54344 56622 75496 81516 113244 163032 226488 360029 500161 720058 1000322 1080087 1440116 1500483 2000644 2160174 2880232 3000966 4001288 4320348 6001932 8640696 12003864 64105541 128211082 192316623 256422164 384633246 512844328 769266492 1538532984 3397593673 6795187346 10192781019 13590374692 20385562038 27180749384 40771124076 81542248152