21662013652555 has 4 divisors (see below), whose sum is σ = 25994416383072. Its totient is φ = 17329610922040.

The previous prime is 21662013652541. The next prime is 21662013652561. The reversal of 21662013652555 is 55525631026612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21662013652555 - 2¹¹ = 21662013650507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21662013652499 and 21662013652508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2166201365251 + ... + 2166201365260.

It is an arithmetic number, because the mean of its divisors is an integer number (6498604095768).

Almost surely, 2^{21662013652555} is an apocalyptic number.

21662013652555 is a deficient number, since it is larger than the sum of its proper divisors (4332402730517).

21662013652555 is an equidigital number, since it uses as much as digits as its factorization.

21662013652555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332402730516.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 21662013652555 in words is "twenty-one trillion, six hundred sixty-two billion, thirteen million, six hundred fifty-two thousand, five hundred fifty-five".