20165326651 has 4 divisors (see below), whose sum is σ = 20165614704. Its totient is φ = 20165038600.

The previous prime is 20165326631. The next prime is 20165326661. The reversal of 20165326651 is 15662356102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20165326651 - 2⁵ = 20165326619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20165326651.

It is not an unprimeable number, because it can be changed into a prime (20165326631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35946 + ... + 204016.

It is an arithmetic number, because the mean of its divisors is an integer number (5041403676).

Almost surely, 2^20165326651 is an apocalyptic number.

20165326651 is a deficient number, since it is larger than the sum of its proper divisors (288053).

20165326651 is a wasteful number, since it uses less digits than its factorization.

20165326651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288052.

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

The spelling of 20165326651 in words is "twenty billion, one hundred sixty-five million, three hundred twenty-six thousand, six hundred fifty-one".