61557040968 has 32 divisors (see below), whose sum is σ = 155746735200. Its totient is φ = 20271795968.

The previous prime is 61557040957. The next prime is 61557041009. The reversal of 61557040968 is 86904075516.

61557040968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61557040968.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15449073 + ... + 15453056.

It is an arithmetic number, because the mean of its divisors is an integer number (4867085475).

Almost surely, 2^61557040968 is an apocalyptic number.

It is an amenable number.

61557040968 is an abundant number, since it is smaller than the sum of its proper divisors (94189694232).

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

61557040968 is a wasteful number, since it uses less digits than its factorization.

61557040968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30902221 (or 30902217 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 61557040968 in words is "sixty-one billion, five hundred fifty-seven million, forty thousand, nine hundred sixty-eight".