66660155601 has 32 divisors (see below), whose sum is σ = 99130687488. Its totient is φ = 39583279680.

The previous prime is 66660155587. The next prime is 66660155609. The reversal of 66660155601 is 10655106666.

It is a de Polignac number, because none of the positive numbers 2^k-66660155601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66660155609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125961 + ... + 386246.

It is an arithmetic number, because the mean of its divisors is an integer number (3097833984).

Almost surely, 2^66660155601 is an apocalyptic number.

It is an amenable number.

66660155601 is a deficient number, since it is larger than the sum of its proper divisors (32470531887).

66660155601 is a wasteful number, since it uses less digits than its factorization.

66660155601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512341.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66660155601 in words is "sixty-six billion, six hundred sixty million, one hundred fifty-five thousand, six hundred one".