20165326631 has 2 divisors, whose sum is σ = 20165326632. Its totient is φ = 20165326630.

The previous prime is 20165326627. The next prime is 20165326661. The reversal of 20165326631 is 13662356102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20165326631 - 2² = 20165326627 is a prime.

It is a super-2 number, since 2×20165326631² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20165326591 and 20165326600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165326661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082663315 + 10082663316.

It is an arithmetic number, because the mean of its divisors is an integer number (10082663316).

Almost surely, 2^20165326631 is an apocalyptic number.

20165326631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165326631 is an equidigital number, since it uses as much as digits as its factorization.

20165326631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 20165326631 in words is "twenty billion, one hundred sixty-five million, three hundred twenty-six thousand, six hundred thirty-one".