645073664770 has 8 divisors (see below), whose sum is σ = 1161132596604. Its totient is φ = 258029465904.

The previous prime is 645073664731. The next prime is 645073664797. The reversal of 645073664770 is 77466370546.

It can be written as a sum of positive squares in 2 ways, for example, as 587968437681 + 57105227089 = 766791^2 + 238967^2 .

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

It is a super-2 number, since 2×645073664770² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32253683229 + ... + 32253683248.

Almost surely, 2^645073664770 is an apocalyptic number.

645073664770 is a deficient number, since it is larger than the sum of its proper divisors (516058931834).

645073664770 is a wasteful number, since it uses less digits than its factorization.

645073664770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64507366484.

The product of its (nonzero) digits is 17781120, while the sum is 55.

The spelling of 645073664770 in words is "six hundred forty-five billion, seventy-three million, six hundred sixty-four thousand, seven hundred seventy".