661047057054 has 12 divisors (see below), whose sum is σ = 1432268623656. Its totient is φ = 220349019012.

The previous prime is 661047057031. The next prime is 661047057091. The reversal of 661047057054 is 450750740166.

661047057054 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 4 + 70 + 570 + 5 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18362418234 + ... + 18362418269.

It is an arithmetic number, because the mean of its divisors is an integer number (119355718638).

Almost surely, 2^661047057054 is an apocalyptic number.

661047057054 is an abundant number, since it is smaller than the sum of its proper divisors (771221566602).

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

661047057054 is a wasteful number, since it uses less digits than its factorization.

661047057054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36724836511 (or 36724836508 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 661047057054 in words is "six hundred sixty-one billion, forty-seven million, fifty-seven thousand, fifty-four".