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161235005165 = 51321327143791
BaseRepresentation
bin1001011000101001011…
…0101110111011101101
3120102011202002220120222
42112022112232323231
510120202130131130
6202023105421125
714435360634233
oct2261226567355
9512152086528
10161235005165
1162419a58893
12272b933a7a5
1312287099300
147b37956953
1542da0dece5
hex258a5aeeed

161235005165 has 24 divisors (see below), whose sum is σ = 209669442048. Its totient is φ = 118975296960.

The previous prime is 161235005137. The next prime is 161235005171. The reversal of 161235005165 is 561500532161.

It is not a de Polignac number, because 161235005165 - 212 = 161235001069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1049420 + ... + 1193210.

It is an arithmetic number, because the mean of its divisors is an integer number (8736226752).

Almost surely, 2161235005165 is an apocalyptic number.

It is an amenable number.

161235005165 is a deficient number, since it is larger than the sum of its proper divisors (48434436883).

161235005165 is a wasteful number, since it uses less digits than its factorization.

161235005165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145149 (or 145136 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 161235005165 in words is "one hundred sixty-one billion, two hundred thirty-five million, five thousand, one hundred sixty-five".

Divisors: 1 5 13 65 169 845 1327 6635 17251 86255 143791 224263 718955 1121315 1869283 9346415 24300679 121503395 190810657 954053285 2480538541 12402692705 32247001033 161235005165