61657251360 has 48 divisors (see below), whose sum is σ = 194220343296. Its totient is φ = 16441933568.

The previous prime is 61657251283. The next prime is 61657251377. The reversal of 61657251360 is 6315275616.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64225824 + ... + 64226783.

It is an arithmetic number, because the mean of its divisors is an integer number (4046257152).

Almost surely, 2^61657251360 is an apocalyptic number.

61657251360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61657251360 is an abundant number, since it is smaller than the sum of its proper divisors (132563091936).

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

61657251360 is a wasteful number, since it uses less digits than its factorization.

61657251360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128452625 (or 128452617 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 61657251360 in words is "sixty-one billion, six hundred fifty-seven million, two hundred fifty-one thousand, three hundred sixty".