21665417485674 has 16 divisors (see below), whose sum is σ = 43339329609120. Its totient is φ = 7220390055600.

The previous prime is 21665417485661. The next prime is 21665417485711. The reversal of 21665417485674 is 47658471456612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353910084 + ... + 353971295.

It is an arithmetic number, because the mean of its divisors is an integer number (2708708100570).

Almost surely, 2^{21665417485674} is an apocalyptic number.

21665417485674 is an abundant number, since it is smaller than the sum of its proper divisors (21673912123446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21665417485674 is a wasteful number, since it uses less digits than its factorization.

21665417485674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707886485.

The product of its digits is 270950400, while the sum is 66.

The spelling of 21665417485674 in words is "twenty-one trillion, six hundred sixty-five billion, four hundred seventeen million, four hundred eighty-five thousand, six hundred seventy-four".