1557155052137 has 2 divisors, whose sum is σ = 1557155052138. Its totient is φ = 1557155052136.

The previous prime is 1557155052073. The next prime is 1557155052139. The reversal of 1557155052137 is 7312505517551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1504201678681 + 52953373456 = 1226459^2 + 230116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557155052137 - 2⁶ = 1557155052073 is a prime.

Together with 1557155052139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1557155052091 and 1557155052100.

It is not a weakly prime, because it can be changed into another prime (1557155052139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778577526068 + 778577526069.

It is an arithmetic number, because the mean of its divisors is an integer number (778577526069).

Almost surely, 2^{1557155052137} is an apocalyptic number.

It is an amenable number.

1557155052137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557155052137 is an equidigital number, since it uses as much as digits as its factorization.

1557155052137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918750, while the sum is 47.

The spelling of 1557155052137 in words is "one trillion, five hundred fifty-seven billion, one hundred fifty-five million, fifty-two thousand, one hundred thirty-seven".