661672326723 has 16 divisors (see below), whose sum is σ = 895751838336. Its totient is φ = 434359062720.

The previous prime is 661672326619. The next prime is 661672326751. The reversal of 661672326723 is 327623276166.

It is not a de Polignac number, because 661672326723 - 2¹⁷ = 661672195651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661672326773) 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, 141586 + ... + 1159047.

It is an arithmetic number, because the mean of its divisors is an integer number (55984489896).

Almost surely, 2^661672326723 is an apocalyptic number.

661672326723 is a deficient number, since it is larger than the sum of its proper divisors (234079511613).

661672326723 is a wasteful number, since it uses less digits than its factorization.

661672326723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303234.

The product of its digits is 4572288, while the sum is 51.

The spelling of 661672326723 in words is "six hundred sixty-one billion, six hundred seventy-two million, three hundred twenty-six thousand, seven hundred twenty-three".