65640793930 has 8 divisors (see below), whose sum is σ = 118153429092. Its totient is φ = 26256317568.

The previous prime is 65640793921. The next prime is 65640793943. The reversal of 65640793930 is 3939704656.

It can be written as a sum of positive squares in 2 ways, for example, as 61633524121 + 4007269809 = 248261^2 + 63303^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3282039687 + ... + 3282039706.

Almost surely, 2^65640793930 is an apocalyptic number.

65640793930 is a deficient number, since it is larger than the sum of its proper divisors (52512635162).

65640793930 is a wasteful number, since it uses less digits than its factorization.

65640793930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6564079400.

The product of its (nonzero) digits is 3674160, while the sum is 52.

The spelling of 65640793930 in words is "sixty-five billion, six hundred forty million, seven hundred ninety-three thousand, nine hundred thirty".