1257166539 has 6 divisors (see below), whose sum is σ = 1815907236. Its totient is φ = 838111020.

The previous prime is 1257166487. The next prime is 1257166549. The reversal of 1257166539 is 9356617521.

1257166539 is a `hidden beast` number, since 1 + 2 + 57 + 1 + 66 + 539 = 666.

It is not a de Polignac number, because 1257166539 - 2⁷ = 1257166411 is a prime.

It is a super-3 number, since 3×1257166539³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1257166494 and 1257166503.

It is not an unprimeable number, because it can be changed into a prime (1257166549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69842577 + ... + 69842594.

It is an arithmetic number, because the mean of its divisors is an integer number (302651206).

Almost surely, 2^1257166539 is an apocalyptic number.

1257166539 is a deficient number, since it is larger than the sum of its proper divisors (558740697).

1257166539 is a wasteful number, since it uses less digits than its factorization.

1257166539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139685177 (or 139685174 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 1257166539 is about 35456.5443747695. The cubic root of 1257166539 is about 1079.2720686332.

The spelling of 1257166539 in words is "one billion, two hundred fifty-seven million, one hundred sixty-six thousand, five hundred thirty-nine".