1557257074 has 4 divisors (see below), whose sum is σ = 2335885614. Its totient is φ = 778628536.

The previous prime is 1557257057. The next prime is 1557257089. The reversal of 1557257074 is 4707527551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4707527551 = 9929 ⋅474119.

It can be written as a sum of positive squares in only one way, i.e., 1497303025 + 59954049 = 38695^2 + 7743^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1557257074.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389314267 + ... + 389314270.

Almost surely, 2^1557257074 is an apocalyptic number.

1557257074 is a deficient number, since it is larger than the sum of its proper divisors (778628540).

1557257074 is an equidigital number, since it uses as much as digits as its factorization.

1557257074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778628539.

The product of its (nonzero) digits is 343000, while the sum is 43.

The square root of 1557257074 is about 39462.0966751641. The cubic root of 1557257074 is about 1159.0978603139.

The spelling of 1557257074 in words is "one billion, five hundred fifty-seven million, two hundred fifty-seven thousand, seventy-four".