19981634146425 has 72 divisors (see below), whose sum is σ = 43054829463360. Its totient is φ = 8653700188800.

The previous prime is 19981634146373. The next prime is 19981634146493. The reversal of 19981634146425 is 52464143618991.

19981634146425 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 1 + 63 + 4 + 146 + 425 = 666.

It is not a de Polignac number, because 19981634146425 - 2¹⁵ = 19981634113657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 333831966 + ... + 333891815.

Almost surely, 2^{19981634146425} is an apocalyptic number.

19981634146425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19981634146425 is an abundant number, since it is smaller than the sum of its proper divisors (23073195316935).

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

19981634146425 is a wasteful number, since it uses less digits than its factorization.

19981634146425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667723823 (or 667723815 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 63.

The spelling of 19981634146425 in words is "nineteen trillion, nine hundred eighty-one billion, six hundred thirty-four million, one hundred forty-six thousand, four hundred twenty-five".