672400161 has 6 divisors (see below), whose sum is σ = 971244690. Its totient is φ = 448266768.

The previous prime is 672400121. The next prime is 672400187. The reversal of 672400161 is 161004276.

It can be written as a sum of positive squares in only one way, i.e., 647957025 + 24443136 = 25455^2 + 4944^2 .

It is not a de Polignac number, because 672400161 - 2⁶ = 672400097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (672400121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37355556 + ... + 37355573.

It is an arithmetic number, because the mean of its divisors is an integer number (161874115).

Almost surely, 2^672400161 is an apocalyptic number.

It is an amenable number.

672400161 is a deficient number, since it is larger than the sum of its proper divisors (298844529).

672400161 is a wasteful number, since it uses less digits than its factorization.

672400161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74711135 (or 74711132 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 672400161 is about 25930.6799178116. The cubic root of 672400161 is about 876.0776538717.

The spelling of 672400161 in words is "six hundred seventy-two million, four hundred thousand, one hundred sixty-one".