640113345 has 48 divisors (see below), whose sum is σ = 1162017792. Its totient is φ = 325353600.

The previous prime is 640113343. The next prime is 640113349. The reversal of 640113345 is 543311046.

640113345 is a `hidden beast` number, since 640 + 1 + 13 + 3 + 4 + 5 = 666.

It is not a de Polignac number, because 640113345 - 2¹ = 640113343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640113343) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 327120 + ... + 329070.

It is an arithmetic number, because the mean of its divisors is an integer number (24208704).

Almost surely, 2^640113345 is an apocalyptic number.

It is an amenable number.

640113345 is a deficient number, since it is larger than the sum of its proper divisors (521904447).

640113345 is a wasteful number, since it uses less digits than its factorization.

640113345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302 (or 2299 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 640113345 is about 25300.4613594298. The cubic root of 640113345 is about 861.8247468431.

The spelling of 640113345 in words is "six hundred forty million, one hundred thirteen thousand, three hundred forty-five".