77596230721 has 3 divisors (see below), whose sum is σ = 77596509283. Its totient is φ = 77595952160.

The previous prime is 77596230671. The next prime is 77596230739. The reversal of 77596230721 is 12703269577.

The square root of 77596230721 is 278561.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12703269577 = 421 ⋅30174037.

It can be written as a sum of positive squares in only one way, i.e., 49035230721 + 28561000000 = 221439^2 + 169000^2 .

It is not a de Polignac number, because 77596230721 - 2¹⁵ = 77596197953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77596230791) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 139281 + ... + 417841.

Almost surely, 2^77596230721 is an apocalyptic number.

77596230721 is the 278561-st square number.

77596230721 is the 139281-st centered octagonal number.

It is an amenable number.

77596230721 is a deficient number, since it is larger than the sum of its proper divisors (278562).

77596230721 is an frugal number, since it uses more digits than its factorization.

77596230721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557122 (or 278561 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 49.

Multiplying 77596230721 by its sum of digits (49), we get a square (3802215305329 = 1949927²).

The spelling of 77596230721 in words is "seventy-seven billion, five hundred ninety-six million, two hundred thirty thousand, seven hundred twenty-one".