61513215552 has 42 divisors (see below), whose sum is σ = 176316527478. Its totient is φ = 20504404992.

The previous prime is 61513215529. The next prime is 61513215563. The reversal of 61513215552 is 25551231516.

61513215552 is a `hidden beast` number, since 61 + 5 + 1 + 32 + 15 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44971140096 + 16542075456 = 212064^2 + 128616^2 .

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 5 ways as a sum of consecutive naturals, for example, 53396313 + ... + 53397464.

It is an arithmetic number, because the mean of its divisors is an integer number (4198012559).

Almost surely, 2^61513215552 is an apocalyptic number.

It is an amenable number.

61513215552 is an abundant number, since it is smaller than the sum of its proper divisors (114803311926).

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

61513215552 is a wasteful number, since it uses less digits than its factorization.

61513215552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106793795 (or 106793782 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The spelling of 61513215552 in words is "sixty-one billion, five hundred thirteen million, two hundred fifteen thousand, five hundred fifty-two".