65640237294 has 32 divisors (see below), whose sum is σ = 131953904640. Its totient is φ = 21768120000.

The previous prime is 65640237281. The next prime is 65640237337. The reversal of 65640237294 is 49273204656.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 916794 + ... + 985794.

It is an arithmetic number, because the mean of its divisors is an integer number (4123559520).

Almost surely, 2^65640237294 is an apocalyptic number.

65640237294 is an abundant number, since it is smaller than the sum of its proper divisors (66313667346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65640237294 is a wasteful number, since it uses less digits than its factorization.

65640237294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69816.

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 65640237294 in words is "sixty-five billion, six hundred forty million, two hundred thirty-seven thousand, two hundred ninety-four".