20614512491 has 2 divisors, whose sum is σ = 20614512492. Its totient is φ = 20614512490.

The previous prime is 20614512487. The next prime is 20614512557. The reversal of 20614512491 is 19421541602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20614512491 - 2² = 20614512487 is a prime.

It is not a weakly prime, because it can be changed into another prime (20614517491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307256245 + 10307256246.

It is an arithmetic number, because the mean of its divisors is an integer number (10307256246).

Almost surely, 2^20614512491 is an apocalyptic number.

20614512491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20614512491 is an equidigital number, since it uses as much as digits as its factorization.

20614512491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 20614512491 in words is "twenty billion, six hundred fourteen million, five hundred twelve thousand, four hundred ninety-one".