645753870513 has 32 divisors (see below), whose sum is σ = 961982524800. Its totient is φ = 428115094848.

The previous prime is 645753870511. The next prime is 645753870569. The reversal of 645753870513 is 315078357546.

645753870513 is a `hidden beast` number, since 6 + 4 + 5 + 7 + 53 + 8 + 70 + 513 = 666.

645753870513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645753870513 - 2¹ = 645753870511 is a prime.

It is a super-2 number, since 2×645753870513² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645753870513.

It is not an unprimeable number, because it can be changed into a prime (645753870511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11690203 + ... + 11745311.

It is an arithmetic number, because the mean of its divisors is an integer number (30061953900).

Almost surely, 2^645753870513 is an apocalyptic number.

It is an amenable number.

645753870513 is a deficient number, since it is larger than the sum of its proper divisors (316228654287).

645753870513 is a wasteful number, since it uses less digits than its factorization.

645753870513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57518 (or 57512 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 54.

The spelling of 645753870513 in words is "six hundred forty-five billion, seven hundred fifty-three million, eight hundred seventy thousand, five hundred thirteen".