19309742657 has 2 divisors, whose sum is σ = 19309742658. Its totient is φ = 19309742656.

The previous prime is 19309742633. The next prime is 19309742659. The reversal of 19309742657 is 75624790391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14245854736 + 5063887921 = 119356^2 + 71161^2 .

It is a cyclic number.

It is not a de Polignac number, because 19309742657 - 2⁶ = 19309742593 is a prime.

It is a super-2 number, since 2×19309742657² (a number of 21 digits) contains 22 as substring.

Together with 19309742659, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19309742599 and 19309742608.

It is not a weakly prime, because it can be changed into another prime (19309742659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9654871328 + 9654871329.

It is an arithmetic number, because the mean of its divisors is an integer number (9654871329).

Almost surely, 2^19309742657 is an apocalyptic number.

It is an amenable number.

19309742657 is a deficient number, since it is larger than the sum of its proper divisors (1).

19309742657 is an equidigital number, since it uses as much as digits as its factorization.

19309742657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The spelling of 19309742657 in words is "nineteen billion, three hundred nine million, seven hundred forty-two thousand, six hundred fifty-seven".