61897929311328 has 96 divisors (see below), whose sum is σ = 177819466188672. Its totient is φ = 18697021824000.

The previous prime is 61897929311293. The next prime is 61897929311359. The reversal of 61897929311328 is 82311392979816.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

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, 93304398 + ... + 93965453.

It is an arithmetic number, because the mean of its divisors is an integer number (1852286106132).

Almost surely, 2^{61897929311328} is an apocalyptic number.

It is an amenable number.

61897929311328 is an abundant number, since it is smaller than the sum of its proper divisors (115921536877344).

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

61897929311328 is a wasteful number, since it uses less digits than its factorization.

61897929311328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187270188 (or 187270180 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 69.

The spelling of 61897929311328 in words is "sixty-one trillion, eight hundred ninety-seven billion, nine hundred twenty-nine million, three hundred eleven thousand, three hundred twenty-eight".