61521120156 has 48 divisors (see below), whose sum is σ = 146439770400. Its totient is φ = 20095076352.

The previous prime is 61521120119. The next prime is 61521120161. The reversal of 61521120156 is 65102112516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454740 + ... + 574308.

It is an arithmetic number, because the mean of its divisors is an integer number (3050828550).

Almost surely, 2^61521120156 is an apocalyptic number.

It is an amenable number.

61521120156 is an abundant number, since it is smaller than the sum of its proper divisors (84918650244).

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

61521120156 is a wasteful number, since it uses less digits than its factorization.

61521120156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120438 (or 120436 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 61521120156 in words is "sixty-one billion, five hundred twenty-one million, one hundred twenty thousand, one hundred fifty-six".