19955767451 has 2 divisors, whose sum is σ = 19955767452. Its totient is φ = 19955767450.

The previous prime is 19955767409. The next prime is 19955767453. The reversal of 19955767451 is 15476755991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19955767451 - 2³⁰ = 18882025627 is a prime.

Together with 19955767453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19955767453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977883725 + 9977883726.

It is an arithmetic number, because the mean of its divisors is an integer number (9977883726).

Almost surely, 2^19955767451 is an apocalyptic number.

19955767451 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955767451 is an equidigital number, since it uses as much as digits as its factorization.

19955767451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907000, while the sum is 59.

The spelling of 19955767451 in words is "nineteen billion, nine hundred fifty-five million, seven hundred sixty-seven thousand, four hundred fifty-one".