772120066721 has 4 divisors (see below), whose sum is σ = 772121855232. Its totient is φ = 772118278212.

The previous prime is 772120066691. The next prime is 772120066747. The reversal of 772120066721 is 127660021277.

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 772120066721 - 2³⁰ = 771046324897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772120066771) 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, 198056 + ... + 1258358.

It is an arithmetic number, because the mean of its divisors is an integer number (193030463808).

Almost surely, 2^772120066721 is an apocalyptic number.

It is an amenable number.

772120066721 is a deficient number, since it is larger than the sum of its proper divisors (1788511).

772120066721 is a wasteful number, since it uses less digits than its factorization.

772120066721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788510.

The product of its (nonzero) digits is 98784, while the sum is 41.

Adding to 772120066721 its reverse (127660021277), we get a palindrome (899780087998).

The spelling of 772120066721 in words is "seven hundred seventy-two billion, one hundred twenty million, sixty-six thousand, seven hundred twenty-one".