672160521661 has 8 divisors (see below), whose sum is σ = 703640156544. Its totient is φ = 640868825520.

The previous prime is 672160521647. The next prime is 672160521727. The reversal of 672160521661 is 166125061276.

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 672160521661 - 2⁷ = 672160521533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672160521611) 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, 46977366 + ... + 46991671.

It is an arithmetic number, because the mean of its divisors is an integer number (87955019568).

Almost surely, 2^672160521661 is an apocalyptic number.

It is an amenable number.

672160521661 is a deficient number, since it is larger than the sum of its proper divisors (31479634883).

672160521661 is a wasteful number, since it uses less digits than its factorization.

672160521661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93969371.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 672160521661 in words is "six hundred seventy-two billion, one hundred sixty million, five hundred twenty-one thousand, six hundred sixty-one".