26623464021 has 80 divisors (see below), whose sum is σ = 50794305408. Its totient is φ = 13492915200.

The previous prime is 26623463987. The next prime is 26623464029. The reversal of 26623464021 is 12046432662.

26623464021 is a `hidden beast` number, since 2 + 6 + 6 + 2 + 3 + 4 + 640 + 2 + 1 = 666.

It is not a de Polignac number, because 26623464021 - 2⁶ = 26623463957 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26623464029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 203661 + ... + 307773.

Almost surely, 2^26623464021 is an apocalyptic number.

26623464021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26623464021 is a deficient number, since it is larger than the sum of its proper divisors (24170841387).

26623464021 is a wasteful number, since it uses less digits than its factorization.

26623464021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104184 (or 104175 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 26623464021 its reverse (12046432662), we get a palindrome (38669896683).

The spelling of 26623464021 in words is "twenty-six billion, six hundred twenty-three million, four hundred sixty-four thousand, twenty-one".