65723706644 has 6 divisors (see below), whose sum is σ = 115016486634. Its totient is φ = 32861853320.

The previous prime is 65723706637. The next prime is 65723706673. The reversal of 65723706644 is 44660732756.

It can be written as a sum of positive squares in only one way, i.e., 42394810000 + 23328896644 = 205900^2 + 152738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65723706592 and 65723706601.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8215463327 + ... + 8215463334.

It is an arithmetic number, because the mean of its divisors is an integer number (19169414439).

Almost surely, 2^65723706644 is an apocalyptic number.

It is an amenable number.

65723706644 is a deficient number, since it is larger than the sum of its proper divisors (49292779990).

65723706644 is a wasteful number, since it uses less digits than its factorization.

65723706644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16430926665 (or 16430926663 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 50.

The spelling of 65723706644 in words is "sixty-five billion, seven hundred twenty-three million, seven hundred six thousand, six hundred forty-four".