672426381621 has 4 divisors (see below), whose sum is σ = 896568508832. Its totient is φ = 448284254412.

The previous prime is 672426381619. The next prime is 672426381643. The reversal of 672426381621 is 126183624276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 672426381621 - 2¹ = 672426381619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672426381691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112071063601 + ... + 112071063606.

It is an arithmetic number, because the mean of its divisors is an integer number (224142127208).

Almost surely, 2^672426381621 is an apocalyptic number.

It is an amenable number.

672426381621 is a deficient number, since it is larger than the sum of its proper divisors (224142127211).

672426381621 is a wasteful number, since it uses less digits than its factorization.

672426381621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224142127210.

The product of its digits is 1161216, while the sum is 48.

The spelling of 672426381621 in words is "six hundred seventy-two billion, four hundred twenty-six million, three hundred eighty-one thousand, six hundred twenty-one".