21655162653 has 16 divisors (see below), whose sum is σ = 30405344640. Its totient is φ = 13682395584.

The previous prime is 21655162621. The next prime is 21655162681. The reversal of 21655162653 is 35626155612.

It is not a de Polignac number, because 21655162653 - 2⁵ = 21655162621 is a prime.

It is a super-3 number, since 3×21655162653³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655162153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1432126 + ... + 1447167.

It is an arithmetic number, because the mean of its divisors is an integer number (1900334040).

Almost surely, 2^21655162653 is an apocalyptic number.

21655162653 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21655162653 is a deficient number, since it is larger than the sum of its proper divisors (8750181987).

21655162653 is a wasteful number, since it uses less digits than its factorization.

21655162653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879428.

The product of its digits is 324000, while the sum is 42.

The spelling of 21655162653 in words is "twenty-one billion, six hundred fifty-five million, one hundred sixty-two thousand, six hundred fifty-three".