640823485705027 has 2 divisors, whose sum is σ = 640823485705028. Its totient is φ = 640823485705026.

The previous prime is 640823485705003. The next prime is 640823485705031. The reversal of 640823485705027 is 720507584328046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640823485705027 is a prime.

It is a super-2 number, since 2×640823485705027² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640823485705087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320411742852513 + 320411742852514.

It is an arithmetic number, because the mean of its divisors is an integer number (320411742852514).

Almost surely, 2^{640823485705027} is an apocalyptic number.

640823485705027 is a deficient number, since it is larger than the sum of its proper divisors (1).

640823485705027 is an equidigital number, since it uses as much as digits as its factorization.

640823485705027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90316800, while the sum is 61.

The spelling of 640823485705027 in words is "six hundred forty trillion, eight hundred twenty-three billion, four hundred eighty-five million, seven hundred five thousand, twenty-seven".