640576181 has 8 divisors (see below), whose sum is σ = 737001600. Its totient is φ = 545379408.

The previous prime is 640576159. The next prime is 640576193. The reversal of 640576181 is 181675046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640576181 - 2¹⁴ = 640559797 is a prime.

It is a super-2 number, since 2×640576181² = 820675687329089522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640576121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306041 + ... + 308126.

It is an arithmetic number, because the mean of its divisors is an integer number (92125200).

Almost surely, 2^640576181 is an apocalyptic number.

It is an amenable number.

640576181 is a deficient number, since it is larger than the sum of its proper divisors (96425419).

640576181 is a wasteful number, since it uses less digits than its factorization.

640576181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614323.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 640576181 is about 25309.6064963484. The cubic root of 640576181 is about 862.0324118461.

The spelling of 640576181 in words is "six hundred forty million, five hundred seventy-six thousand, one hundred eighty-one".