26667864864 has 72 divisors (see below), whose sum is σ = 75852543312. Its totient is φ = 8887436160.

The previous prime is 26667864857. The next prime is 26667864871. The reversal of 26667864864 is 46846876662.

It is an interprime number because it is at equal distance from previous prime (26667864857) and next prime (26667864871).

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×26667864864² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2576179 + ... + 2586509.

It is an arithmetic number, because the mean of its divisors is an integer number (1053507546).

Almost surely, 2^26667864864 is an apocalyptic number.

26667864864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

26667864864 is an abundant number, since it is smaller than the sum of its proper divisors (49184678448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26667864864 is a wasteful number, since it uses less digits than its factorization.

26667864864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19310 (or 19299 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 63.

The spelling of 26667864864 in words is "twenty-six billion, six hundred sixty-seven million, eight hundred sixty-four thousand, eight hundred sixty-four".