640605151 has 2 divisors, whose sum is σ = 640605152. Its totient is φ = 640605150.

The previous prime is 640605127. The next prime is 640605167. The reversal of 640605151 is 151506046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640605151 - 2⁹ = 640604639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640605181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320302575 + 320302576.

It is an arithmetic number, because the mean of its divisors is an integer number (320302576).

Almost surely, 2^640605151 is an apocalyptic number.

640605151 is a deficient number, since it is larger than the sum of its proper divisors (1).

640605151 is an equidigital number, since it uses as much as digits as its factorization.

640605151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 640605151 is about 25310.1788022132. The cubic root of 640605151 is about 862.0454067629.

The spelling of 640605151 in words is "six hundred forty million, six hundred five thousand, one hundred fifty-one".