772197971721 has 16 divisors (see below), whose sum is σ = 1159429214208. Its totient is φ = 452902035600.

The previous prime is 772197971719. The next prime is 772197971731. The reversal of 772197971721 is 127179791277.

It is not a de Polignac number, because 772197971721 - 2¹ = 772197971719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (772197971731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377417341 + ... + 377419386.

It is an arithmetic number, because the mean of its divisors is an integer number (72464325888).

Almost surely, 2^772197971721 is an apocalyptic number.

It is an amenable number.

772197971721 is a deficient number, since it is larger than the sum of its proper divisors (387231242487).

772197971721 is a wasteful number, since it uses less digits than its factorization.

772197971721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754836772.

The product of its digits is 5445468, while the sum is 60.

The spelling of 772197971721 in words is "seven hundred seventy-two billion, one hundred ninety-seven million, nine hundred seventy-one thousand, seven hundred twenty-one".