646902011 has 16 divisors (see below), whose sum is σ = 752713728. Its totient is φ = 544471200.

The previous prime is 646902001. The next prime is 646902023. The reversal of 646902011 is 110209646.

It is not a de Polignac number, because 646902011 - 2¹⁸ = 646639867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646902001) 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, 388166 + ... + 389828.

It is an arithmetic number, because the mean of its divisors is an integer number (47044608).

Almost surely, 2^646902011 is an apocalyptic number.

646902011 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

646902011 is a deficient number, since it is larger than the sum of its proper divisors (105811717).

646902011 is a wasteful number, since it uses less digits than its factorization.

646902011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 646902011 is about 25434.2684384670. The cubic root of 646902011 is about 864.8607084117.

The spelling of 646902011 in words is "six hundred forty-six million, nine hundred two thousand, eleven".