19455020551 has 2 divisors, whose sum is σ = 19455020552. Its totient is φ = 19455020550.

The previous prime is 19455020537. The next prime is 19455020567. The reversal of 19455020551 is 15502055491.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19455020551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19455020551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19455020251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9727510275 + 9727510276.

It is an arithmetic number, because the mean of its divisors is an integer number (9727510276).

Almost surely, 2^19455020551 is an apocalyptic number.

19455020551 is a deficient number, since it is larger than the sum of its proper divisors (1).

19455020551 is an equidigital number, since it uses as much as digits as its factorization.

19455020551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 19455020551 in words is "nineteen billion, four hundred fifty-five million, twenty thousand, five hundred fifty-one".