65990791784 has 8 divisors (see below), whose sum is σ = 123732734610. Its totient is φ = 32995395888.

The previous prime is 65990791721. The next prime is 65990791817. The reversal of 65990791784 is 48719709956.

It can be written as a sum of positive squares in only one way, i.e., 37141769284 + 28849022500 = 192722^2 + 169850^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 65990791784.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4124424479 + ... + 4124424494.

Almost surely, 2^65990791784 is an apocalyptic number.

It is an amenable number.

65990791784 is a deficient number, since it is larger than the sum of its proper divisors (57741942826).

65990791784 is a wasteful number, since it uses less digits than its factorization.

65990791784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8248848979 (or 8248848975 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 65990791784 in words is "sixty-five billion, nine hundred ninety million, seven hundred ninety-one thousand, seven hundred eighty-four".