66604140687 has 16 divisors (see below), whose sum is σ = 101504441600. Its totient is φ = 38054852352.

The previous prime is 66604140679. The next prime is 66604140737. The reversal of 66604140687 is 78604140666.

66604140687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66604140687 - 2³ = 66604140679 is a prime.

It is a super-2 number, since 2×66604140687² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604140667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14437 + ... + 365262.

It is an arithmetic number, because the mean of its divisors is an integer number (6344027600).

Almost surely, 2^66604140687 is an apocalyptic number.

66604140687 is a deficient number, since it is larger than the sum of its proper divisors (34900300913).

66604140687 is a wasteful number, since it uses less digits than its factorization.

66604140687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388062.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 66604140687 in words is "sixty-six billion, six hundred four million, one hundred forty thousand, six hundred eighty-seven".