672159975821 has 16 divisors (see below), whose sum is σ = 692612344320. Its totient is φ = 651829083840.

The previous prime is 672159975787. The next prime is 672159975913. The reversal of 672159975821 is 128579951276.

It is a cyclic number.

It is not a de Polignac number, because 672159975821 - 2¹⁸ = 672159713677 is a prime.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672159974821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62295095 + ... + 62305883.

It is an arithmetic number, because the mean of its divisors is an integer number (43288271520).

Almost surely, 2^672159975821 is an apocalyptic number.

It is an amenable number.

672159975821 is a deficient number, since it is larger than the sum of its proper divisors (20452368499).

672159975821 is a wasteful number, since it uses less digits than its factorization.

672159975821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16244.

The product of its digits is 19051200, while the sum is 62.

The spelling of 672159975821 in words is "six hundred seventy-two billion, one hundred fifty-nine million, nine hundred seventy-five thousand, eight hundred twenty-one".