20614512557 has 2 divisors, whose sum is σ = 20614512558. Its totient is φ = 20614512556.

The previous prime is 20614512491. The next prime is 20614512617. The reversal of 20614512557 is 75521541602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13221780196 + 7392732361 = 114986^2 + 85981^2 .

It is a cyclic number.

It is not a de Polignac number, because 20614512557 - 2⁸ = 20614512301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20614512557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20614512157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307256278 + 10307256279.

It is an arithmetic number, because the mean of its divisors is an integer number (10307256279).

Almost surely, 2^20614512557 is an apocalyptic number.

It is an amenable number.

20614512557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20614512557 is an equidigital number, since it uses as much as digits as its factorization.

20614512557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 38.

The spelling of 20614512557 in words is "twenty billion, six hundred fourteen million, five hundred twelve thousand, five hundred fifty-seven".