20614624991 has 2 divisors, whose sum is σ = 20614624992. Its totient is φ = 20614624990.

The previous prime is 20614624913. The next prime is 20614625011. The reversal of 20614624991 is 19942641602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20614624991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20614629991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307312495 + 10307312496.

It is an arithmetic number, because the mean of its divisors is an integer number (10307312496).

Almost surely, 2^20614624991 is an apocalyptic number.

20614624991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20614624991 is an equidigital number, since it uses as much as digits as its factorization.

20614624991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 20614624991 in words is "twenty billion, six hundred fourteen million, six hundred twenty-four thousand, nine hundred ninety-one".