66661601115 has 16 divisors (see below), whose sum is σ = 109541226528. Its totient is φ = 34591965696.

The previous prime is 66661601093. The next prime is 66661601177. The reversal of 66661601115 is 51110616666.

It is not a de Polignac number, because 66661601115 - 2⁶ = 66661601051 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60054942 + ... + 60056051.

It is an arithmetic number, because the mean of its divisors is an integer number (6846326658).

Almost surely, 2^66661601115 is an apocalyptic number.

66661601115 is a deficient number, since it is larger than the sum of its proper divisors (42879625413).

66661601115 is a wasteful number, since it uses less digits than its factorization.

66661601115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120111038.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 66661601115 in words is "sixty-six billion, six hundred sixty-one million, six hundred one thousand, one hundred fifteen".