12772517621 has 2 divisors, whose sum is σ = 12772517622. Its totient is φ = 12772517620.

The previous prime is 12772517603. The next prime is 12772517629. The reversal of 12772517621 is 12671527721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8021172721 + 4751344900 = 89561^2 + 68930^2 .

It is an emirp because it is prime and its reverse (12671527721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12772517621 - 2⁶ = 12772517557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12772517629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6386258810 + 6386258811.

It is an arithmetic number, because the mean of its divisors is an integer number (6386258811).

Almost surely, 2^12772517621 is an apocalyptic number.

It is an amenable number.

12772517621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12772517621 is an equidigital number, since it uses as much as digits as its factorization.

12772517621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 41.

The spelling of 12772517621 in words is "twelve billion, seven hundred seventy-two million, five hundred seventeen thousand, six hundred twenty-one".