646161372 has 36 divisors (see below), whose sum is σ = 1664175240. Its totient is φ = 211322592.

The previous prime is 646161371. The next prime is 646161389. The reversal of 646161372 is 273161646.

It is a happy number.

646161372 is a `hidden beast` number, since 6 + 4 + 616 + 1 + 37 + 2 = 666.

646161372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646161371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167422 + ... + 171237.

It is an arithmetic number, because the mean of its divisors is an integer number (46227090).

Almost surely, 2^646161372 is an apocalyptic number.

It is an amenable number.

646161372 is an abundant number, since it is smaller than the sum of its proper divisors (1018013868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646161372 is a wasteful number, since it uses less digits than its factorization.

646161372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338722 (or 338717 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 646161372 is about 25419.7044042609. The cubic root of 646161372 is about 864.5305222989.

The spelling of 646161372 in words is "six hundred forty-six million, one hundred sixty-one thousand, three hundred seventy-two".