15616061604 has 144 divisors (see below), whose sum is σ = 48092990400. Its totient is φ = 4368090240.

The previous prime is 15616061581. The next prime is 15616061611. The reversal of 15616061604 is 40616061651.

It is a happy number.

It is a super-2 number, since 2×15616061604² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 82822 + ... + 195170.

It is an arithmetic number, because the mean of its divisors is an integer number (333979100).

Almost surely, 2^15616061604 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 15616061604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24046495200).

15616061604 is an abundant number, since it is smaller than the sum of its proper divisors (32476928796).

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

15616061604 is a wasteful number, since it uses less digits than its factorization.

15616061604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112392 (or 112378 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 15616061604 in words is "fifteen billion, six hundred sixteen million, sixty-one thousand, six hundred four".