672231561 has 16 divisors (see below), whose sum is σ = 953193600. Its totient is φ = 419943168.

The previous prime is 672231551. The next prime is 672231587. The reversal of 672231561 is 165132276.

It is not a de Polignac number, because 672231561 - 2¹⁴ = 672215177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (672231551) 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, 17101 + ... + 40458.

It is an arithmetic number, because the mean of its divisors is an integer number (59574600).

Almost surely, 2^672231561 is an apocalyptic number.

It is an amenable number.

672231561 is a deficient number, since it is larger than the sum of its proper divisors (280962039).

672231561 is a wasteful number, since it uses less digits than its factorization.

672231561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57808.

The product of its digits is 15120, while the sum is 33.

The square root of 672231561 is about 25927.4287386929. The cubic root of 672231561 is about 876.0044241452.

It can be divided in two parts, 6722 and 31561, that added together give a palindrome (38283).

The spelling of 672231561 in words is "six hundred seventy-two million, two hundred thirty-one thousand, five hundred sixty-one".