264138673679 has 4 divisors (see below), whose sum is σ = 270281433576. Its totient is φ = 257995913784.

The previous prime is 264138673661. The next prime is 264138673691. The reversal of 264138673679 is 976376831462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 264138673679 - 2²⁴ = 264121896463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264138673609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3071379884 + ... + 3071379969.

It is an arithmetic number, because the mean of its divisors is an integer number (67570358394).

Almost surely, 2^264138673679 is an apocalyptic number.

264138673679 is a deficient number, since it is larger than the sum of its proper divisors (6142759897).

264138673679 is an equidigital number, since it uses as much as digits as its factorization.

264138673679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6142759896.

The product of its digits is 54867456, while the sum is 62.

The spelling of 264138673679 in words is "two hundred sixty-four billion, one hundred thirty-eight million, six hundred seventy-three thousand, six hundred seventy-nine".