646164373 has 4 divisors (see below), whose sum is σ = 684174060. Its totient is φ = 608154688.

The previous prime is 646164371. The next prime is 646164377. The reversal of 646164373 is 373461646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 428365809 + 217798564 = 20697^2 + 14758^2 .

It is a cyclic number.

It is not a de Polignac number, because 646164373 - 2¹ = 646164371 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 (646164371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19004818 + ... + 19004851.

It is an arithmetic number, because the mean of its divisors is an integer number (171043515).

Almost surely, 2^646164373 is an apocalyptic number.

It is an amenable number.

646164373 is a deficient number, since it is larger than the sum of its proper divisors (38009687).

646164373 is a wasteful number, since it uses less digits than its factorization.

646164373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38009686.

The product of its digits is 217728, while the sum is 40.

The square root of 646164373 is about 25419.7634332029. The cubic root of 646164373 is about 864.5318606911.

The spelling of 646164373 in words is "six hundred forty-six million, one hundred sixty-four thousand, three hundred seventy-three".