672642513891 has 12 divisors (see below), whose sum is σ = 971620660920. Its totient is φ = 448416380160.

The previous prime is 672642513839. The next prime is 672642513901. The reversal of 672642513891 is 198315246276.

It is a happy number.

672642513891 is a `hidden beast` number, since 6 + 7 + 2 + 6 + 4 + 251 + 389 + 1 = 666.

It is not a de Polignac number, because 672642513891 - 2⁹ = 672642513379 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (672642513821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 633790 + ... + 1321731.

It is an arithmetic number, because the mean of its divisors is an integer number (80968388410).

Almost surely, 2^672642513891 is an apocalyptic number.

672642513891 is a deficient number, since it is larger than the sum of its proper divisors (298978147029).

672642513891 is a wasteful number, since it uses less digits than its factorization.

672642513891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993746 (or 1993743 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 672642513891 in words is "six hundred seventy-two billion, six hundred forty-two million, five hundred thirteen thousand, eight hundred ninety-one".