640541151 has 12 divisors (see below), whose sum is σ = 950232712. Its totient is φ = 415485936.

The previous prime is 640541141. The next prime is 640541177. The reversal of 640541151 is 151145046.

640541151 is a `hidden beast` number, since 640 + 5 + 4 + 1 + 15 + 1 = 666.

It is not a de Polignac number, because 640541151 - 2¹⁵ = 640508383 is a prime.

It is a super-2 number, since 2×640541151² = 820585932248809602, 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 (640541101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 961441 + ... + 962106.

Almost surely, 2^640541151 is an apocalyptic number.

640541151 is a deficient number, since it is larger than the sum of its proper divisors (309691561).

640541151 is a wasteful number, since it uses less digits than its factorization.

640541151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923590 (or 1923587 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 640541151 is about 25308.9144571631. The cubic root of 640541151 is about 862.0166981044.

Adding to 640541151 its reverse (151145046), we get a palindrome (791686197).

The spelling of 640541151 in words is "six hundred forty million, five hundred forty-one thousand, one hundred fifty-one".