640335563245 has 16 divisors (see below), whose sum is σ = 880998213888. Its totient is φ = 437675379840.

The previous prime is 640335563233. The next prime is 640335563279. The reversal of 640335563245 is 542365533046.

It is not a de Polignac number, because 640335563245 - 2⁹ = 640335562733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640335563195 and 640335563204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29402784 + ... + 29424553.

It is an arithmetic number, because the mean of its divisors is an integer number (55062388368).

Almost surely, 2^640335563245 is an apocalyptic number.

It is an amenable number.

640335563245 is a deficient number, since it is larger than the sum of its proper divisors (240662650643).

640335563245 is a wasteful number, since it uses less digits than its factorization.

640335563245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58827660.

The product of its (nonzero) digits is 3888000, while the sum is 46.

The spelling of 640335563245 in words is "six hundred forty billion, three hundred thirty-five million, five hundred sixty-three thousand, two hundred forty-five".