26665891612 has 48 divisors (see below), whose sum is σ = 49394257920. Its totient is φ = 12577320000.

The previous prime is 26665891591. The next prime is 26665891613. The reversal of 26665891612 is 21619856662.

It is a super-2 number, since 2×26665891612² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26665891612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26665891613) 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, 1453714 + ... + 1471942.

It is an arithmetic number, because the mean of its divisors is an integer number (1029047040).

Almost surely, 2^26665891612 is an apocalyptic number.

It is an amenable number.

26665891612 is a deficient number, since it is larger than the sum of its proper divisors (22728366308).

26665891612 is a wasteful number, since it uses less digits than its factorization.

26665891612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18562 (or 18560 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The spelling of 26665891612 in words is "twenty-six billion, six hundred sixty-five million, eight hundred ninety-one thousand, six hundred twelve".