640254156067 has 2 divisors, whose sum is σ = 640254156068. Its totient is φ = 640254156066.

The previous prime is 640254156053. The next prime is 640254156151. The reversal of 640254156067 is 760651452046.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640254156067 is a prime.

It is a super-2 number, since 2×640254156067² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640254151067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320127078033 + 320127078034.

It is an arithmetic number, because the mean of its divisors is an integer number (320127078034).

Almost surely, 2^640254156067 is an apocalyptic number.

640254156067 is a deficient number, since it is larger than the sum of its proper divisors (1).

640254156067 is an equidigital number, since it uses as much as digits as its factorization.

640254156067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 640254156067 in words is "six hundred forty billion, two hundred fifty-four million, one hundred fifty-six thousand, sixty-seven".