65723700645 has 128 divisors (see below), whose sum is σ = 123011481600. Its totient is φ = 33249533184.

The previous prime is 65723700607. The next prime is 65723700661. The reversal of 65723700645 is 54600732756.

65723700645 is a `hidden beast` number, since 6 + 572 + 3 + 70 + 0 + 6 + 4 + 5 = 666.

65723700645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65723700645 - 2⁷ = 65723700517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 65723700645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 72462282 + ... + 72463188.

It is an arithmetic number, because the mean of its divisors is an integer number (961027200).

Almost surely, 2^65723700645 is an apocalyptic number.

It is an amenable number.

65723700645 is a deficient number, since it is larger than the sum of its proper divisors (57287780955).

65723700645 is a wasteful number, since it uses less digits than its factorization.

65723700645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 45.

The spelling of 65723700645 in words is "sixty-five billion, seven hundred twenty-three million, seven hundred thousand, six hundred forty-five".