26400664063 has 4 divisors (see below), whose sum is σ = 27953644320. Its totient is φ = 24847683808.

The previous prime is 26400664051. The next prime is 26400664067. The reversal of 26400664063 is 36046600462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26400664063 - 2¹³ = 26400655871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26400664067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776490103 + ... + 776490136.

It is an arithmetic number, because the mean of its divisors is an integer number (6988411080).

Almost surely, 2^26400664063 is an apocalyptic number.

26400664063 is a deficient number, since it is larger than the sum of its proper divisors (1552980257).

26400664063 is a wasteful number, since it uses less digits than its factorization.

26400664063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552980256.

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 26400664063 in words is "twenty-six billion, four hundred million, six hundred sixty-four thousand, sixty-three".