73772512721 has 8 divisors (see below), whose sum is σ = 76319743080. Its totient is φ = 71225505792.

The previous prime is 73772512703. The next prime is 73772512747. The reversal of 73772512721 is 12721527737.

It can be written as a sum of positive squares in 4 ways, for example, as 22746672400 + 51025840321 = 150820^2 + 225889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73772512721 - 2¹⁰ = 73772511697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73772512921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884411 + ... + 964223.

It is an arithmetic number, because the mean of its divisors is an integer number (9539967885).

Almost surely, 2^73772512721 is an apocalyptic number.

It is an amenable number.

73772512721 is a deficient number, since it is larger than the sum of its proper divisors (2547230359).

73772512721 is a wasteful number, since it uses less digits than its factorization.

73772512721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111715.

The product of its digits is 288120, while the sum is 44.

The spelling of 73772512721 in words is "seventy-three billion, seven hundred seventy-two million, five hundred twelve thousand, seven hundred twenty-one".