19550412256491 has 8 divisors (see below), whose sum is σ = 28963573713360. Its totient is φ = 13033608170976.

The previous prime is 19550412256447. The next prime is 19550412256513. The reversal of 19550412256491 is 19465221405591.

19550412256491 is a `hidden beast` number, since 1 + 9 + 5 + 50 + 4 + 1 + 22 + 564 + 9 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-19550412256491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19550412256411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362044671390 + ... + 362044671443.

It is an arithmetic number, because the mean of its divisors is an integer number (3620446714170).

Almost surely, 2^{19550412256491} is an apocalyptic number.

19550412256491 is a deficient number, since it is larger than the sum of its proper divisors (9413161456869).

19550412256491 is an equidigital number, since it uses as much as digits as its factorization.

19550412256491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724089342842 (or 724089342836 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 54.

The spelling of 19550412256491 in words is "nineteen trillion, five hundred fifty billion, four hundred twelve million, two hundred fifty-six thousand, four hundred ninety-one".