61605254920 has 64 divisors (see below), whose sum is σ = 151244418240. Its totient is φ = 22397241600.

The previous prime is 61605254861. The next prime is 61605254933. The reversal of 61605254920 is 2945250616.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 2651755 + ... + 2674885.

It is an arithmetic number, because the mean of its divisors is an integer number (2363194035).

Almost surely, 2^61605254920 is an apocalyptic number.

It is an amenable number.

61605254920 is an abundant number, since it is smaller than the sum of its proper divisors (89639163320).

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

61605254920 is a wasteful number, since it uses less digits than its factorization.

61605254920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29206 (or 29202 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 61605254920 in words is "sixty-one billion, six hundred five million, two hundred fifty-four thousand, nine hundred twenty".