646260911 has 4 divisors (see below), whose sum is σ = 668545800. Its totient is φ = 623976024.

The previous prime is 646260887. The next prime is 646260929. The reversal of 646260911 is 119062646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119062646 = 2 ⋅59531323.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646260911 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 (646260931) 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, 11142401 + ... + 11142458.

It is an arithmetic number, because the mean of its divisors is an integer number (167136450).

Almost surely, 2^646260911 is an apocalyptic number.

646260911 is a deficient number, since it is larger than the sum of its proper divisors (22284889).

646260911 is a wasteful number, since it uses less digits than its factorization.

646260911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22284888.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 646260911 is about 25421.6622391220. The cubic root of 646260911 is about 864.5749126989.

The spelling of 646260911 in words is "six hundred forty-six million, two hundred sixty thousand, nine hundred eleven".