672149103409 has 27 divisors (see below), whose sum is σ = 787596800097. Its totient is φ = 571951502304.

The previous prime is 672149103407. The next prime is 672149103443. The reversal of 672149103409 is 904301941276.

The square root of 672149103409 is 819847.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 578659925809 + 93489177600 = 760697^2 + 305760^2 .

It is not a de Polignac number, because 672149103409 - 2¹ = 672149103407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672149103407) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 992834379 + ... + 992835055.

Almost surely, 2^672149103409 is an apocalyptic number.

672149103409 is the 819847-th square number.

672149103409 is the 409924-th centered octagonal number.

It is an amenable number.

672149103409 is a deficient number, since it is larger than the sum of its proper divisors (115447696688).

672149103409 is an frugal number, since it uses more digits than its factorization.

672149103409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 672149103409 in words is "six hundred seventy-two billion, one hundred forty-nine million, one hundred three thousand, four hundred nine".