26645315664 has 80 divisors (see below), whose sum is σ = 75116067264. Its totient is φ = 8071680000.

The previous prime is 26645315663. The next prime is 26645315689. The reversal of 26645315664 is 46651354662.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26645315663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2106222 + ... + 2118834.

Almost surely, 2^26645315664 is an apocalyptic number.

26645315664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

26645315664 is an abundant number, since it is smaller than the sum of its proper divisors (48470751600).

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

26645315664 is a wasteful number, since it uses less digits than its factorization.

26645315664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16636 (or 16630 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 48.

The spelling of 26645315664 in words is "twenty-six billion, six hundred forty-five million, three hundred fifteen thousand, six hundred sixty-four".