640255011 has 16 divisors (see below), whose sum is σ = 963394560. Its totient is φ = 374652320.

The previous prime is 640254983. The next prime is 640255019. The reversal of 640255011 is 110552046.

It is a cyclic number.

It is not a de Polignac number, because 640255011 - 2²² = 636060707 is a prime.

It is a super-2 number, since 2×640255011² = 819852958221220242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640255019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333555 + ... + 335468.

It is an arithmetic number, because the mean of its divisors is an integer number (60212160).

Almost surely, 2^640255011 is an apocalyptic number.

640255011 is a deficient number, since it is larger than the sum of its proper divisors (323139549).

640255011 is a wasteful number, since it uses less digits than its factorization.

640255011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669066.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 640255011 is about 25303.2608768119. The cubic root of 640255011 is about 861.8883200940. Note that the first 3 decimals are identical.

The spelling of 640255011 in words is "six hundred forty million, two hundred fifty-five thousand, eleven".