72665103123664 has 10 divisors (see below), whose sum is σ = 140788637302130. Its totient is φ = 36332551561824.

The previous prime is 72665103123659. The next prime is 72665103123707. The reversal of 72665103123664 is 46632130156627.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 70353511290000 + 2311591833664 = 8387700^2 + 1520392^2 .

It is a super-2 number, since 2×72665103123664² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2270784472599 + ... + 2270784472630.

It is an arithmetic number, because the mean of its divisors is an integer number (14078863730213).

Almost surely, 2^{72665103123664} is an apocalyptic number.

It is an amenable number.

72665103123664 is a deficient number, since it is larger than the sum of its proper divisors (68123534178466).

72665103123664 is a wasteful number, since it uses less digits than its factorization.

72665103123664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541568945237 (or 4541568945231 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 72665103123664 in words is "seventy-two trillion, six hundred sixty-five billion, one hundred three million, one hundred twenty-three thousand, six hundred sixty-four".