20112356665 has 32 divisors (see below), whose sum is σ = 24813768960. Its totient is φ = 15644448000.

The previous prime is 20112356639. The next prime is 20112356687. The reversal of 20112356665 is 56665321102.

It is not a de Polignac number, because 20112356665 - 2⁹ = 20112356153 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, 10545642 + ... + 10547548.

It is an arithmetic number, because the mean of its divisors is an integer number (775430280).

Almost surely, 2^20112356665 is an apocalyptic number.

It is an amenable number.

20112356665 is a deficient number, since it is larger than the sum of its proper divisors (4701412295).

20112356665 is a wasteful number, since it uses less digits than its factorization.

20112356665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 20112356665 its reverse (56665321102), we get a palindrome (76777677767).

The spelling of 20112356665 in words is "twenty billion, one hundred twelve million, three hundred fifty-six thousand, six hundred sixty-five".