61757477640 has 96 divisors (see below), whose sum is σ = 211275604800. Its totient is φ = 15601887360.

The previous prime is 61757477543. The next prime is 61757477641. The reversal of 61757477640 is 4677475716.

It is a happy number.

61757477640 is a `hidden beast` number, since 6 + 1 + 7 + 574 + 7 + 7 + 64 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (61757477641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4507596 + ... + 4521275.

It is an arithmetic number, because the mean of its divisors is an integer number (2200787550).

Almost surely, 2^61757477640 is an apocalyptic number.

61757477640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61757477640 is an abundant number, since it is smaller than the sum of its proper divisors (149518127160).

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

61757477640 is a wasteful number, since it uses less digits than its factorization.

61757477640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9028907 (or 9028900 counting only the distinct ones).

The product of its (nonzero) digits is 6914880, while the sum is 54.

The spelling of 61757477640 in words is "sixty-one billion, seven hundred fifty-seven million, four hundred seventy-seven thousand, six hundred forty".