672540661 has 8 divisors (see below), whose sum is σ = 724502240. Its totient is φ = 620611632.

The previous prime is 672540643. The next prime is 672540697. The reversal of 672540661 is 166045276.

It is a happy number.

672540661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 672540661 - 2⁹ = 672540149 is a prime.

It is a super-3 number, since 3×672540661³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 672540661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672540611) 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, 50446 + ... + 62368.

It is an arithmetic number, because the mean of its divisors is an integer number (90562780).

Almost surely, 2^672540661 is an apocalyptic number.

It is an amenable number.

672540661 is a deficient number, since it is larger than the sum of its proper divisors (51961579).

672540661 is a wasteful number, since it uses less digits than its factorization.

672540661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16275.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 672540661 is about 25933.3889223911. The cubic root of 672540661 is about 876.1386692934.

The spelling of 672540661 in words is "six hundred seventy-two million, five hundred forty thousand, six hundred sixty-one".