640115420107 has 2 divisors, whose sum is σ = 640115420108. Its totient is φ = 640115420106.

The previous prime is 640115420059. The next prime is 640115420183. The reversal of 640115420107 is 701024511046.

640115420107 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 640115420107 - 2³⁹ = 90359606219 is a prime.

It is a super-2 number, since 2×640115420107² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640115420807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320057710053 + 320057710054.

It is an arithmetic number, because the mean of its divisors is an integer number (320057710054).

Almost surely, 2^640115420107 is an apocalyptic number.

640115420107 is a deficient number, since it is larger than the sum of its proper divisors (1).

640115420107 is an equidigital number, since it uses as much as digits as its factorization.

640115420107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 640115420107 in words is "six hundred forty billion, one hundred fifteen million, four hundred twenty thousand, one hundred seven".