64622066393 has 4 divisors (see below), whose sum is σ = 66850413540. Its totient is φ = 62393719248.

The previous prime is 64622066389. The next prime is 64622066407. The reversal of 64622066393 is 39366022646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40486268944 + 24135797449 = 201212^2 + 155357^2 .

It is a cyclic number.

It is not a de Polignac number, because 64622066393 - 2² = 64622066389 is a prime.

It is a super-2 number, since 2×64622066393² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64642066393) 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, 1114173530 + ... + 1114173587.

It is an arithmetic number, because the mean of its divisors is an integer number (16712603385).

Almost surely, 2^64622066393 is an apocalyptic number.

It is an amenable number.

64622066393 is a deficient number, since it is larger than the sum of its proper divisors (2228347147).

64622066393 is a wasteful number, since it uses less digits than its factorization.

64622066393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228347146.

The product of its (nonzero) digits is 1679616, while the sum is 47.

The spelling of 64622066393 in words is "sixty-four billion, six hundred twenty-two million, sixty-six thousand, three hundred ninety-three".