65640793929 has 16 divisors (see below), whose sum is σ = 88987738944. Its totient is φ = 43027704000.

The previous prime is 65640793921. The next prime is 65640793943. The reversal of 65640793929 is 92939704656.

It is not a de Polignac number, because 65640793929 - 2³ = 65640793921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65640793921) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 458827 + ... + 584639.

It is an arithmetic number, because the mean of its divisors is an integer number (5561733684).

Almost surely, 2^65640793929 is an apocalyptic number.

It is an amenable number.

65640793929 is a deficient number, since it is larger than the sum of its proper divisors (23346945015).

65640793929 is a wasteful number, since it uses less digits than its factorization.

65640793929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128728.

The product of its (nonzero) digits is 22044960, while the sum is 60.

The spelling of 65640793929 in words is "sixty-five billion, six hundred forty million, seven hundred ninety-three thousand, nine hundred twenty-nine".