1257170530549 has 2 divisors, whose sum is σ = 1257170530550. Its totient is φ = 1257170530548.

The previous prime is 1257170530537. The next prime is 1257170530591. The reversal of 1257170530549 is 9450350717521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017455516100 + 239715014449 = 1008690^2 + 489607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257170530549 - 2¹¹ = 1257170528501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257170510549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628585265274 + 628585265275.

It is an arithmetic number, because the mean of its divisors is an integer number (628585265275).

Almost surely, 2^{1257170530549} is an apocalyptic number.

It is an amenable number.

1257170530549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257170530549 is an equidigital number, since it uses as much as digits as its factorization.

1257170530549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323000, while the sum is 49.

The spelling of 1257170530549 in words is "one trillion, two hundred fifty-seven billion, one hundred seventy million, five hundred thirty thousand, five hundred forty-nine".