26421526665 has 24 divisors (see below), whose sum is σ = 45814591680. Its totient is φ = 14086164384.

The previous prime is 26421526657. The next prime is 26421526693. The reversal of 26421526665 is 56662512462.

It is not a de Polignac number, because 26421526665 - 2³ = 26421526657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 26421526665.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 11316 + ... + 230154.

It is an arithmetic number, because the mean of its divisors is an integer number (1908941320).

Almost surely, 2^26421526665 is an apocalyptic number.

It is an amenable number.

26421526665 is a deficient number, since it is larger than the sum of its proper divisors (19393065015).

26421526665 is a wasteful number, since it uses less digits than its factorization.

26421526665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221533 (or 221530 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 26421526665 in words is "twenty-six billion, four hundred twenty-one million, five hundred twenty-six thousand, six hundred sixty-five".