672101561 has 16 divisors (see below), whose sum is σ = 725251968. Its totient is φ = 621244800.

The previous prime is 672101543. The next prime is 672101569. The reversal of 672101561 is 165101276.

672101561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 672101561 - 2²⁶ = 604992697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672101569) 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, 97571 + ... + 104231.

It is an arithmetic number, because the mean of its divisors is an integer number (45328248).

Almost surely, 2^672101561 is an apocalyptic number.

It is an amenable number.

672101561 is a deficient number, since it is larger than the sum of its proper divisors (53150407).

672101561 is a wasteful number, since it uses less digits than its factorization.

672101561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6832.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 672101561 is about 25924.9216199394. The cubic root of 672101561 is about 875.9479515825.

The spelling of 672101561 in words is "six hundred seventy-two million, one hundred one thousand, five hundred sixty-one".