640142334529 has 2 divisors, whose sum is σ = 640142334530. Its totient is φ = 640142334528.

The previous prime is 640142334509. The next prime is 640142334547. The reversal of 640142334529 is 925433241046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631540143025 + 8602191504 = 794695^2 + 92748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640142334529 is a prime.

It is not a weakly prime, because it can be changed into another prime (640142334509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320071167264 + 320071167265.

It is an arithmetic number, because the mean of its divisors is an integer number (320071167265).

Almost surely, 2^640142334529 is an apocalyptic number.

It is an amenable number.

640142334529 is a deficient number, since it is larger than the sum of its proper divisors (1).

640142334529 is an equidigital number, since it uses as much as digits as its factorization.

640142334529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 640142334529 in words is "six hundred forty billion, one hundred forty-two million, three hundred thirty-four thousand, five hundred twenty-nine".