20111650631 has 2 divisors, whose sum is σ = 20111650632. Its totient is φ = 20111650630.

The previous prime is 20111650627. The next prime is 20111650633. The reversal of 20111650631 is 13605611102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111650631 - 2² = 20111650627 is a prime.

It is a super-2 number, since 2×20111650631² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20111650633, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111650631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111650633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055825315 + 10055825316.

It is an arithmetic number, because the mean of its divisors is an integer number (10055825316).

Almost surely, 2^20111650631 is an apocalyptic number.

20111650631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111650631 is an equidigital number, since it uses as much as digits as its factorization.

20111650631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The spelling of 20111650631 in words is "twenty billion, one hundred eleven million, six hundred fifty thousand, six hundred thirty-one".