65996783640 has 128 divisors (see below), whose sum is σ = 227575224000. Its totient is φ = 16992267264.

The previous prime is 65996783623. The next prime is 65996783647. The reversal of 65996783640 is 4638769956.

65996783640 is a `hidden beast` number, since 6 + 599 + 6 + 7 + 8 + 36 + 4 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65996783647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1022269 + ... + 1084908.

Almost surely, 2^65996783640 is an apocalyptic number.

65996783640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65996783640 is an abundant number, since it is smaller than the sum of its proper divisors (161578440360).

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

65996783640 is a wasteful number, since it uses less digits than its factorization.

65996783640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107226 (or 2107216 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 63.

The spelling of 65996783640 in words is "sixty-five billion, nine hundred ninety-six million, seven hundred eighty-three thousand, six hundred forty".