645537712570 has 8 divisors (see below), whose sum is σ = 1161967882644. Its totient is φ = 258215085024.

The previous prime is 645537712529. The next prime is 645537712571. The reversal of 645537712570 is 75217735546.

645537712570 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 598065582409 + 47472130161 = 773347^2 + 217881^2 .

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

It is not an unprimeable number, because it can be changed into a prime (645537712571) 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, 32276885619 + ... + 32276885638.

Almost surely, 2^645537712570 is an apocalyptic number.

645537712570 is a deficient number, since it is larger than the sum of its proper divisors (516430170074).

645537712570 is a wasteful number, since it uses less digits than its factorization.

645537712570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64553771264.

The product of its (nonzero) digits is 6174000, while the sum is 52.

The spelling of 645537712570 in words is "six hundred forty-five billion, five hundred thirty-seven million, seven hundred twelve thousand, five hundred seventy".