19625505917868 has 72 divisors (see below), whose sum is σ = 50546061086976. Its totient is φ = 6419129320800.

The previous prime is 19625505917861. The next prime is 19625505917879. The reversal of 19625505917868 is 86871950552691.

19625505917868 is a `hidden beast` number, since 1 + 9 + 6 + 2 + 550 + 5 + 9 + 1 + 7 + 8 + 68 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19625505917796 and 19625505917805.

It is not an unprimeable number, because it can be changed into a prime (19625505917861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17655496 + ... + 18734127.

It is an arithmetic number, because the mean of its divisors is an integer number (702028626208).

Almost surely, 2^{19625505917868} is an apocalyptic number.

19625505917868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19625505917868 is an abundant number, since it is smaller than the sum of its proper divisors (30920555169108).

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

19625505917868 is a wasteful number, since it uses less digits than its factorization.

19625505917868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36389915 (or 36389910 counting only the distinct ones).

The product of its (nonzero) digits is 326592000, while the sum is 72.

The spelling of 19625505917868 in words is "nineteen trillion, six hundred twenty-five billion, five hundred five million, nine hundred seventeen thousand, eight hundred sixty-eight".