640600645031 has 2 divisors, whose sum is σ = 640600645032. Its totient is φ = 640600645030.

The previous prime is 640600644997. The next prime is 640600645067. The reversal of 640600645031 is 130546006046.

640600645031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640600645031 - 2¹⁰ = 640600644007 is a prime.

It is a super-2 number, since 2×640600645031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640600644982 and 640600645000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640600645831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320300322515 + 320300322516.

It is an arithmetic number, because the mean of its divisors is an integer number (320300322516).

Almost surely, 2^640600645031 is an apocalyptic number.

640600645031 is a deficient number, since it is larger than the sum of its proper divisors (1).

640600645031 is an equidigital number, since it uses as much as digits as its factorization.

640600645031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 640600645031 in words is "six hundred forty billion, six hundred million, six hundred forty-five thousand, thirty-one".