640310412502157 has 2 divisors, whose sum is σ = 640310412502158. Its totient is φ = 640310412502156.

The previous prime is 640310412502153. The next prime is 640310412502301. The reversal of 640310412502157 is 751205214013046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506713200904681 + 133597211597476 = 22510291^2 + 11558426^2 .

It is a cyclic number.

It is not a de Polignac number, because 640310412502157 - 2² = 640310412502153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640310412502153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320155206251078 + 320155206251079.

It is an arithmetic number, because the mean of its divisors is an integer number (320155206251079).

Almost surely, 2^{640310412502157} is an apocalyptic number.

It is an amenable number.

640310412502157 is a deficient number, since it is larger than the sum of its proper divisors (1).

640310412502157 is an equidigital number, since it uses as much as digits as its factorization.

640310412502157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 640310412502157 in words is "six hundred forty trillion, three hundred ten billion, four hundred twelve million, five hundred two thousand, one hundred fifty-seven".