646955567 has 16 divisors (see below), whose sum is σ = 687744000. Its totient is φ = 606877920.

The previous prime is 646955537. The next prime is 646955581. The reversal of 646955567 is 765559646.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 646955567 - 2⁶ = 646955503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646955537) 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, 1500842 + ... + 1501272.

It is an arithmetic number, because the mean of its divisors is an integer number (42984000).

Almost surely, 2^646955567 is an apocalyptic number.

646955567 is a deficient number, since it is larger than the sum of its proper divisors (40788433).

646955567 is a wasteful number, since it uses less digits than its factorization.

646955567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046.

The product of its digits is 6804000, while the sum is 53.

The square root of 646955567 is about 25435.3212482170. The cubic root of 646955567 is about 864.8845745724.

The spelling of 646955567 in words is "six hundred forty-six million, nine hundred fifty-five thousand, five hundred sixty-seven".