19551027804 has 48 divisors (see below), whose sum is σ = 56875719936. Its totient is φ = 5078188800.

The previous prime is 19551027799. The next prime is 19551027823. The reversal of 19551027804 is 40872015591.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10578637 + ... + 10580484.

It is an arithmetic number, because the mean of its divisors is an integer number (1184910832).

Almost surely, 2^19551027804 is an apocalyptic number.

19551027804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19551027804 is an abundant number, since it is smaller than the sum of its proper divisors (37324692132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19551027804 is a wasteful number, since it uses less digits than its factorization.

19551027804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21159146 (or 21159144 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 19551027804 in words is "nineteen billion, five hundred fifty-one million, twenty-seven thousand, eight hundred four".