661047057056 has 24 divisors (see below), whose sum is σ = 1302125467860. Its totient is φ = 330348525568.

The previous prime is 661047057031. The next prime is 661047057091. The reversal of 661047057056 is 650750740166.

661047057056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 639648048400 + 21399008656 = 799780^2 + 146284^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 661047057056.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5407451 + ... + 5528346.

Almost surely, 2^661047057056 is an apocalyptic number.

It is an amenable number.

661047057056 is a deficient number, since it is larger than the sum of its proper divisors (641078410804).

661047057056 is a wasteful number, since it uses less digits than its factorization.

661047057056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10937696 (or 10937688 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 661047057056 in words is "six hundred sixty-one billion, forty-seven million, fifty-seven thousand, fifty-six".