26431228665 has 40 divisors (see below), whose sum is σ = 49440460608. Its totient is φ = 13483752480.

The previous prime is 26431228597. The next prime is 26431228667. The reversal of 26431228665 is 56682213462.

It is not a de Polignac number, because 26431228665 - 2¹⁸ = 26430966521 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 26431228665.

It is not an unprimeable number, because it can be changed into a prime (26431228667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1409431 + ... + 1428060.

Almost surely, 2^26431228665 is an apocalyptic number.

It is an amenable number.

26431228665 is a deficient number, since it is larger than the sum of its proper divisors (23009231943).

26431228665 is a wasteful number, since it uses less digits than its factorization.

26431228665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837531 (or 2837522 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 26431228665 in words is "twenty-six billion, four hundred thirty-one million, two hundred twenty-eight thousand, six hundred sixty-five".