64321565690 has 8 divisors (see below), whose sum is σ = 115778818260. Its totient is φ = 25728626272.

The previous prime is 64321565681. The next prime is 64321565701. The reversal of 64321565690 is 9656512346.

It can be written as a sum of positive squares in 2 ways, for example, as 53683499809 + 10638065881 = 231697^2 + 103141^2 .

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

It is a super-2 number, since 2×64321565690² (a number of 22 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, 3216078275 + ... + 3216078294.

Almost surely, 2^64321565690 is an apocalyptic number.

64321565690 is a deficient number, since it is larger than the sum of its proper divisors (51457252570).

64321565690 is a wasteful number, since it uses less digits than its factorization.

64321565690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432156576.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 64321565690 in words is "sixty-four billion, three hundred twenty-one million, five hundred sixty-five thousand, six hundred ninety".