640252151 has 16 divisors (see below), whose sum is σ = 804342528. Its totient is φ = 495081600.

The previous prime is 640252133. The next prime is 640252163. The reversal of 640252151 is 151252046.

It is a cyclic number.

It is not a de Polignac number, because 640252151 - 2¹⁴ = 640235767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640252151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640252651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21650 + ... + 41823.

It is an arithmetic number, because the mean of its divisors is an integer number (50271408).

Almost surely, 2^640252151 is an apocalyptic number.

640252151 is a deficient number, since it is larger than the sum of its proper divisors (164090377).

640252151 is a wasteful number, since it uses less digits than its factorization.

640252151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63622.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 640252151 is about 25303.2043622937. The cubic root of 640252151 is about 861.8870367490.

The spelling of 640252151 in words is "six hundred forty million, two hundred fifty-two thousand, one hundred fifty-one".