646468061 has 16 divisors (see below), whose sum is σ = 717009408. Its totient is φ = 579744000.

The previous prime is 646468049. The next prime is 646468091. The reversal of 646468061 is 160864646.

It is a cyclic number.

It is not a de Polignac number, because 646468061 - 2²⁶ = 579359197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646468021) 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, 102911 + ... + 109011.

It is an arithmetic number, because the mean of its divisors is an integer number (44813088).

Almost surely, 2^646468061 is an apocalyptic number.

It is an amenable number.

646468061 is a deficient number, since it is larger than the sum of its proper divisors (70541347).

646468061 is a wasteful number, since it uses less digits than its factorization.

646468061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 646468061 is about 25425.7361938647. The cubic root of 646468061 is about 864.6672786757.

The spelling of 646468061 in words is "six hundred forty-six million, four hundred sixty-eight thousand, sixty-one".