20762585805665 has 16 divisors (see below), whose sum is σ = 27189672895296. Its totient is φ = 15094750977600.

The previous prime is 20762585805641. The next prime is 20762585805673. The reversal of 20762585805665 is 56650858526702.

It is not a de Polignac number, because 20762585805665 - 2²² = 20762581611361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66235046 + ... + 66547775.

It is an arithmetic number, because the mean of its divisors is an integer number (1699354555956).

Almost surely, 2^{20762585805665} is an apocalyptic number.

It is an amenable number.

20762585805665 is a deficient number, since it is larger than the sum of its proper divisors (6427087089631).

20762585805665 is a wasteful number, since it uses less digits than its factorization.

20762585805665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132785680.

The product of its (nonzero) digits is 241920000, while the sum is 65.

The spelling of 20762585805665 in words is "twenty trillion, seven hundred sixty-two billion, five hundred eighty-five million, eight hundred five thousand, six hundred sixty-five".