1557945297 has 24 divisors (see below), whose sum is σ = 2394082080. Its totient is φ = 972881280.

The previous prime is 1557945253. The next prime is 1557945313. The reversal of 1557945297 is 7925497551.

It is a happy number.

1557945297 is a `hidden beast` number, since 1 + 5 + 579 + 45 + 29 + 7 = 666.

It is not a de Polignac number, because 1557945297 - 2⁸ = 1557945041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1557945217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8154 + ... + 56412.

It is an arithmetic number, because the mean of its divisors is an integer number (99753420).

Almost surely, 2^1557945297 is an apocalyptic number.

1557945297 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1557945297 is a deficient number, since it is larger than the sum of its proper divisors (836136783).

1557945297 is a wasteful number, since it uses less digits than its factorization.

1557945297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48493 (or 48490 counting only the distinct ones).

The product of its digits is 3969000, while the sum is 54.

The square root of 1557945297 is about 39470.8157630419. The cubic root of 1557945297 is about 1159.2685879206.

The spelling of 1557945297 in words is "one billion, five hundred fifty-seven million, nine hundred forty-five thousand, two hundred ninety-seven".