21615545046663 has 40 divisors (see below), whose sum is σ = 32376980787536. Its totient is φ = 14371517664000.

The previous prime is 21615545046653. The next prime is 21615545046703. The reversal of 21615545046663 is 36664054551612.

It is not a de Polignac number, because 21615545046663 - 2¹⁴ = 21615545030279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21615545046653) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 107761263 + ... + 107961663.

Almost surely, 2^{21615545046663} is an apocalyptic number.

21615545046663 is a deficient number, since it is larger than the sum of its proper divisors (10761435740873).

21615545046663 is a wasteful number, since it uses less digits than its factorization.

21615545046663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203997 (or 203988 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 21615545046663 in words is "twenty-one trillion, six hundred fifteen billion, five hundred forty-five million, forty-six thousand, six hundred sixty-three".