66357670556 has 18 divisors (see below), whose sum is σ = 117445425720. Its totient is φ = 32806023712.

The previous prime is 66357670549. The next prime is 66357670559. The reversal of 66357670556 is 65507675366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66357670559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1015496 + ... + 1078863.

Almost surely, 2^66357670556 is an apocalyptic number.

It is an amenable number.

66357670556 is a deficient number, since it is larger than the sum of its proper divisors (51087755164).

66357670556 is a wasteful number, since it uses less digits than its factorization.

66357670556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094541 (or 2094450 counting only the distinct ones).

The product of its (nonzero) digits is 23814000, while the sum is 56.

The spelling of 66357670556 in words is "sixty-six billion, three hundred fifty-seven million, six hundred seventy thousand, five hundred fifty-six".