1577221442117 has 2 divisors, whose sum is σ = 1577221442118. Its totient is φ = 1577221442116.

The previous prime is 1577221442077. The next prime is 1577221442119. The reversal of 1577221442117 is 7112441227751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 880545763876 + 696675678241 = 938374^2 + 834671^2 .

It is an emirp because it is prime and its reverse (7112441227751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1577221442117 - 2²⁸ = 1576953006661 is a prime.

Together with 1577221442119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1577221442119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 788610721058 + 788610721059.

It is an arithmetic number, because the mean of its divisors is an integer number (788610721059).

Almost surely, 2^{1577221442117} is an apocalyptic number.

It is an amenable number.

1577221442117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1577221442117 is an equidigital number, since it uses as much as digits as its factorization.

1577221442117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219520, while the sum is 44.

Adding to 1577221442117 its reverse (7112441227751), we get a palindrome (8689662669868).

The spelling of 1577221442117 in words is "one trillion, five hundred seventy-seven billion, two hundred twenty-one million, four hundred forty-two thousand, one hundred seventeen".