19551097399 has 16 divisors (see below), whose sum is σ = 20723295744. Its totient is φ = 18406634400.

The previous prime is 19551097381. The next prime is 19551097457. The reversal of 19551097399 is 99379015591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19551097399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19551097309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 991264 + ... + 1010794.

It is an arithmetic number, because the mean of its divisors is an integer number (1295205984).

Almost surely, 2^19551097399 is an apocalyptic number.

19551097399 is a deficient number, since it is larger than the sum of its proper divisors (1172198345).

19551097399 is a wasteful number, since it uses less digits than its factorization.

19551097399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20238.

The product of its (nonzero) digits is 3444525, while the sum is 58.

The spelling of 19551097399 in words is "nineteen billion, five hundred fifty-one million, ninety-seven thousand, three hundred ninety-nine".