672371661 has 8 divisors (see below), whose sum is σ = 965456800. Its totient is φ = 413767152.

The previous prime is 672371653. The next prime is 672371681. The reversal of 672371661 is 166173276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 672371661 - 2³ = 672371653 is a prime.

It is a super-3 number, since 3×672371661³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 17240299 = 672371661 / (6 + 7 + 2 + 3 + 7 + 1 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672371681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8620111 + ... + 8620188.

It is an arithmetic number, because the mean of its divisors is an integer number (120682100).

Almost surely, 2^672371661 is an apocalyptic number.

It is an amenable number.

672371661 is a deficient number, since it is larger than the sum of its proper divisors (293085139).

672371661 is a wasteful number, since it uses less digits than its factorization.

672371661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17240315.

The product of its digits is 63504, while the sum is 39.

The square root of 672371661 is about 25930.1303698998. The cubic root of 672371661 is about 876.0652760411.

The spelling of 672371661 in words is "six hundred seventy-two million, three hundred seventy-one thousand, six hundred sixty-one".