645517650370 has 8 divisors (see below), whose sum is σ = 1161931770684. Its totient is φ = 258207060144.

The previous prime is 645517650301. The next prime is 645517650373. The reversal of 645517650370 is 73056715546.

645517650370 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 644955154281 + 562496089 = 803091^2 + 23717^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×645517650370² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645517650373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32275882509 + ... + 32275882528.

Almost surely, 2^645517650370 is an apocalyptic number.

645517650370 is a deficient number, since it is larger than the sum of its proper divisors (516414120314).

645517650370 is a wasteful number, since it uses less digits than its factorization.

645517650370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64551765044.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 645517650370 in words is "six hundred forty-five billion, five hundred seventeen million, six hundred fifty thousand, three hundred seventy".