19634455157 has 2 divisors, whose sum is σ = 19634455158. Its totient is φ = 19634455156.

The previous prime is 19634455097. The next prime is 19634455189. The reversal of 19634455157 is 75155443691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10087992721 + 9546462436 = 100439^2 + 97706^2 .

It is a cyclic number.

It is not a de Polignac number, because 19634455157 - 2³⁰ = 18560713333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19634455457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9817227578 + 9817227579.

It is an arithmetic number, because the mean of its divisors is an integer number (9817227579).

Almost surely, 2^19634455157 is an apocalyptic number.

It is an amenable number.

19634455157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19634455157 is an equidigital number, since it uses as much as digits as its factorization.

19634455157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268000, while the sum is 50.

The spelling of 19634455157 in words is "nineteen billion, six hundred thirty-four million, four hundred fifty-five thousand, one hundred fifty-seven".