61513215600 has 60 divisors (see below), whose sum is σ = 197047337816. Its totient is φ = 16403523840.

The previous prime is 61513215583. The next prime is 61513215611. The reversal of 61513215600 is 651231516.

61513215600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25629307 + ... + 25631706.

Almost surely, 2^61513215600 is an apocalyptic number.

61513215600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61513215600 is an abundant number, since it is smaller than the sum of its proper divisors (135534122216).

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

61513215600 is a wasteful number, since it uses less digits than its factorization.

61513215600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51261034 (or 51261023 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 61513215600 in words is "sixty-one billion, five hundred thirteen million, two hundred fifteen thousand, six hundred".