19625668451 has 2 divisors, whose sum is σ = 19625668452. Its totient is φ = 19625668450.

The previous prime is 19625668397. The next prime is 19625668477. The reversal of 19625668451 is 15486652691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19625668451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19625668393 and 19625668402.

It is not a weakly prime, because it can be changed into another prime (19625668151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9812834225 + 9812834226.

It is an arithmetic number, because the mean of its divisors is an integer number (9812834226).

Almost surely, 2^19625668451 is an apocalyptic number.

19625668451 is a deficient number, since it is larger than the sum of its proper divisors (1).

19625668451 is an equidigital number, since it uses as much as digits as its factorization.

19625668451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 53.

The spelling of 19625668451 in words is "nineteen billion, six hundred twenty-five million, six hundred sixty-eight thousand, four hundred fifty-one".