8139661560 has 192 divisors, whose sum is σ = 28372874400. Its totient is φ = 2017446912.

The previous prime is 8139661559. The next prime is 8139661597. The reversal of 8139661560 is 651669318.

8139661560 is a `hidden beast` number, since 81 + 3 + 9 + 6 + 6 + 1 + 560 = 666.

It is a super-2 number, since 2×8139661560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 351294 + ... + 373746.

Almost surely, 2^8139661560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8139661560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14186437200).

8139661560 is an abundant number, since it is smaller than the sum of its proper divisors (20233212840).

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

8139661560 is a wasteful number, since it uses less digits than its factorization.

8139661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22542 (or 22535 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 8139661560 is about 90220.0729328014. The cubic root of 8139661560 is about 2011.5713857350.

The spelling of 8139661560 in words is "eight billion, one hundred thirty-nine million, six hundred sixty-one thousand, five hundred sixty".