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66561128938 = 2103967320107
BaseRepresentation
bin111101111111010110…
…100011100111101010
320100210202111200121201
4331333112203213222
52042304122111223
650324443554414
74544306155333
oct757726434752
9210722450551
1066561128938
1126257027377
1210a9722ba0a
136379b61ac5
14331600b28a
151ae877aead
hexf7f5a39ea

66561128938 has 8 divisors (see below), whose sum is σ = 99842965632. Its totient is φ = 33280140396.

The previous prime is 66561128927. The next prime is 66561128981. The reversal of 66561128938 is 83982116566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×665611289382 (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47881 + ... + 367987.

It is an arithmetic number, because the mean of its divisors is an integer number (12480370704).

Almost surely, 266561128938 is an apocalyptic number.

66561128938 is a deficient number, since it is larger than the sum of its proper divisors (33281836694).

66561128938 is a wasteful number, since it uses less digits than its factorization.

66561128938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424076.

The product of its digits is 3732480, while the sum is 55.

The spelling of 66561128938 in words is "sixty-six billion, five hundred sixty-one million, one hundred twenty-eight thousand, nine hundred thirty-eight".

Divisors: 1 2 103967 207934 320107 640214 33280564469 66561128938