66151520756 has 12 divisors (see below), whose sum is σ = 115813074468. Its totient is φ = 33062070912.

The previous prime is 66151520731. The next prime is 66151520761. The reversal of 66151520756 is 65702515166.

It can be written as a sum of positive squares in 2 ways, for example, as 48085472656 + 18066048100 = 219284^2 + 134410^2 .

It is a congruent number.

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, 3411491 + ... + 3430826.

It is an arithmetic number, because the mean of its divisors is an integer number (9651089539).

Almost surely, 2^66151520756 is an apocalyptic number.

It is an amenable number.

66151520756 is a deficient number, since it is larger than the sum of its proper divisors (49661553712).

66151520756 is a wasteful number, since it uses less digits than its factorization.

66151520756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844738 (or 6844736 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 66151520756 in words is "sixty-six billion, one hundred fifty-one million, five hundred twenty thousand, seven hundred fifty-six".