66864431067 has 48 divisors (see below), whose sum is σ = 106284711168. Its totient is φ = 36614410560.

The previous prime is 66864431063. The next prime is 66864431069. The reversal of 66864431067 is 76013446866.

It is not a de Polignac number, because 66864431067 - 2² = 66864431063 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66864431063) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2041692 + ... + 2074182.

It is an arithmetic number, because the mean of its divisors is an integer number (2214264816).

Almost surely, 2^66864431067 is an apocalyptic number.

66864431067 is a deficient number, since it is larger than the sum of its proper divisors (39420280101).

66864431067 is a wasteful number, since it uses less digits than its factorization.

66864431067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32640 (or 32597 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 66864431067 in words is "sixty-six billion, eight hundred sixty-four million, four hundred thirty-one thousand, sixty-seven".