264138673681 has 8 divisors (see below), whose sum is σ = 265241132928. Its totient is φ = 263038482000.

The previous prime is 264138673661. The next prime is 264138673691. The reversal of 264138673681 is 186376831462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 264138673681 - 2⁵ = 264138673649 is a prime.

It is a super-2 number, since 2×264138673681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264138673661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333235 + ... + 799576.

It is an arithmetic number, because the mean of its divisors is an integer number (33155141616).

Almost surely, 2^264138673681 is an apocalyptic number.

It is an amenable number.

264138673681 is a deficient number, since it is larger than the sum of its proper divisors (1102459247).

264138673681 is a wasteful number, since it uses less digits than its factorization.

264138673681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133783.

The product of its digits is 6967296, while the sum is 55.

The spelling of 264138673681 in words is "two hundred sixty-four billion, one hundred thirty-eight million, six hundred seventy-three thousand, six hundred eighty-one".