772572344221 has 4 divisors (see below), whose sum is σ = 818017776252. Its totient is φ = 727126912192.

The previous prime is 772572344209. The next prime is 772572344261. The reversal of 772572344221 is 122443275277.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122443275277 = 3313 ⋅36958429.

It can be written as a sum of positive squares in 2 ways, for example, as 334215796996 + 438356547225 = 578114^2 + 662085^2 .

It is a cyclic number.

It is not a de Polignac number, because 772572344221 - 2⁹ = 772572343709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772572344261) 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, 22722715990 + ... + 22722716023.

It is an arithmetic number, because the mean of its divisors is an integer number (204504444063).

Almost surely, 2^772572344221 is an apocalyptic number.

It is an amenable number.

772572344221 is a deficient number, since it is larger than the sum of its proper divisors (45445432031).

772572344221 is a wasteful number, since it uses less digits than its factorization.

772572344221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45445432030.

The product of its digits is 1317120, while the sum is 46.

The spelling of 772572344221 in words is "seven hundred seventy-two billion, five hundred seventy-two million, three hundred forty-four thousand, two hundred twenty-one".