26623638403 has 4 divisors (see below), whose sum is σ = 26898109000. Its totient is φ = 26349167808.

The previous prime is 26623638401. The next prime is 26623638421. The reversal of 26623638403 is 30483632662.

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 26623638403 - 2¹ = 26623638401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26623638403.

It is not an unprimeable number, because it can be changed into a prime (26623638401) 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, 137235153 + ... + 137235346.

It is an arithmetic number, because the mean of its divisors is an integer number (6724527250).

Almost surely, 2^26623638403 is an apocalyptic number.

26623638403 is a deficient number, since it is larger than the sum of its proper divisors (274470597).

26623638403 is an equidigital number, since it uses as much as digits as its factorization.

26623638403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274470596.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 26623638403 in words is "twenty-six billion, six hundred twenty-three million, six hundred thirty-eight thousand, four hundred three".