61400818764 has 36 divisors (see below), whose sum is σ = 155598612624. Its totient is φ = 20415380832.

The previous prime is 61400818747. The next prime is 61400818771. The reversal of 61400818764 is 46781800416.

61400818764 is a `hidden beast` number, since 6 + 1 + 400 + 8 + 187 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2133792 + ... + 2162375.

It is an arithmetic number, because the mean of its divisors is an integer number (4322183684).

Almost surely, 2^61400818764 is an apocalyptic number.

It is an amenable number.

61400818764 is an abundant number, since it is smaller than the sum of its proper divisors (94197793860).

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

61400818764 is a wasteful number, since it uses less digits than its factorization.

61400818764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296574 (or 4296569 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 61400818764 in words is "sixty-one billion, four hundred million, eight hundred eighteen thousand, seven hundred sixty-four".