72750566646721 has 4 divisors (see below), whose sum is σ = 74442440289712. Its totient is φ = 71058693003732.

The previous prime is 72750566646707. The next prime is 72750566646809. The reversal of 72750566646721 is 12764666505727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72750566646721 - 2⁹ = 72750566646209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72750566646221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845936821431 + ... + 845936821516.

It is an arithmetic number, because the mean of its divisors is an integer number (18610610072428).

Almost surely, 2^{72750566646721} is an apocalyptic number.

It is an amenable number.

72750566646721 is a deficient number, since it is larger than the sum of its proper divisors (1691873642991).

72750566646721 is a wasteful number, since it uses less digits than its factorization.

72750566646721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691873642990.

The product of its (nonzero) digits is 177811200, while the sum is 64.

The spelling of 72750566646721 in words is "seventy-two trillion, seven hundred fifty billion, five hundred sixty-six million, six hundred forty-six thousand, seven hundred twenty-one".