21669548456545 has 32 divisors (see below), whose sum is σ = 28404027025920. Its totient is φ = 15739335536640.

The previous prime is 21669548456531. The next prime is 21669548456587. The reversal of 21669548456545 is 54565484596612.

It is not a de Polignac number, because 21669548456545 - 2²⁹ = 21669011585633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252213064 + ... + 252298966.

It is an arithmetic number, because the mean of its divisors is an integer number (887625844560).

Almost surely, 2^{21669548456545} is an apocalyptic number.

It is an amenable number.

21669548456545 is a deficient number, since it is larger than the sum of its proper divisors (6734478569375).

21669548456545 is a wasteful number, since it uses less digits than its factorization.

21669548456545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91785.

The product of its digits is 1244160000, while the sum is 70.

The spelling of 21669548456545 in words is "twenty-one trillion, six hundred sixty-nine billion, five hundred forty-eight million, four hundred fifty-six thousand, five hundred forty-five".