646312161 has 8 divisors (see below), whose sum is σ = 940090464. Its totient is φ = 391704320.

The previous prime is 646312153. The next prime is 646312223. The reversal of 646312161 is 161213646.

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 646312161 - 2³ = 646312153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646311161) 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, 9792576 + ... + 9792641.

It is an arithmetic number, because the mean of its divisors is an integer number (117511308).

Almost surely, 2^646312161 is an apocalyptic number.

It is an amenable number.

646312161 is a deficient number, since it is larger than the sum of its proper divisors (293778303).

646312161 is a wasteful number, since it uses less digits than its factorization.

646312161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19585231.

The product of its digits is 5184, while the sum is 30.

The square root of 646312161 is about 25422.6702177407. The cubic root of 646312161 is about 864.5977663649.

The spelling of 646312161 in words is "six hundred forty-six million, three hundred twelve thousand, one hundred sixty-one".