640172053403 has 2 divisors, whose sum is σ = 640172053404. Its totient is φ = 640172053402.

The previous prime is 640172053379. The next prime is 640172053501. The reversal of 640172053403 is 304350271046.

640172053403 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 a de Polignac number, because none of the positive numbers 2^k-640172053403 is a prime.

It is not a weakly prime, because it can be changed into another prime (640172853403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320086026701 + 320086026702.

It is an arithmetic number, because the mean of its divisors is an integer number (320086026702).

Almost surely, 2^640172053403 is an apocalyptic number.

640172053403 is a deficient number, since it is larger than the sum of its proper divisors (1).

640172053403 is an equidigital number, since it uses as much as digits as its factorization.

640172053403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 35.

The spelling of 640172053403 in words is "six hundred forty billion, one hundred seventy-two million, fifty-three thousand, four hundred three".