61521488016 has 80 divisors (see below), whose sum is σ = 159415153920. Its totient is φ = 20444744320.

The previous prime is 61521487981. The next prime is 61521488047. The reversal of 61521488016 is 61088412516.

61521488016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 30713671 + ... + 30715673.

It is an arithmetic number, because the mean of its divisors is an integer number (1992689424).

Almost surely, 2^61521488016 is an apocalyptic number.

It is an amenable number.

61521488016 is an abundant number, since it is smaller than the sum of its proper divisors (97893665904).

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

61521488016 is a wasteful number, since it uses less digits than its factorization.

61521488016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644 (or 3638 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 61521488016 in words is "sixty-one billion, five hundred twenty-one million, four hundred eighty-eight thousand, sixteen".