26553985021 has 4 divisors (see below), whose sum is σ = 27951563200. Its totient is φ = 25156406844.

The previous prime is 26553985009. The next prime is 26553985061. The reversal of 26553985021 is 12058935562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26553985021 is a prime.

It is a super-2 number, since 2×26553985021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26553985061) 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, 698789061 + ... + 698789098.

It is an arithmetic number, because the mean of its divisors is an integer number (6987890800).

Almost surely, 2^26553985021 is an apocalyptic number.

It is an amenable number.

26553985021 is a deficient number, since it is larger than the sum of its proper divisors (1397578179).

26553985021 is a wasteful number, since it uses less digits than its factorization.

26553985021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397578178.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 26553985021 in words is "twenty-six billion, five hundred fifty-three million, nine hundred eighty-five thousand, twenty-one".