661095316512 has 36 divisors (see below), whose sum is σ = 1879989807150. Its totient is φ = 220365105408.

The previous prime is 661095316507. The next prime is 661095316537. The reversal of 661095316512 is 215613590166.

661095316512 is a `hidden beast` number, since 6 + 6 + 10 + 95 + 31 + 6 + 512 = 666.

661095316512 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 660910465296 + 184851216 = 812964^2 + 13596^2 .

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

It is a super-2 number, since 2×661095316512² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1147734637 + ... + 1147735212.

Almost surely, 2^661095316512 is an apocalyptic number.

It is an amenable number.

661095316512 is an abundant number, since it is smaller than the sum of its proper divisors (1218894490638).

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

661095316512 is a wasteful number, since it uses less digits than its factorization.

661095316512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295469865 (or 2295469854 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 661095316512 in words is "six hundred sixty-one billion, ninety-five million, three hundred sixteen thousand, five hundred twelve".