1557256564 has 6 divisors (see below), whose sum is σ = 2725198994. Its totient is φ = 778628280.

The previous prime is 1557256543. The next prime is 1557256621. The reversal of 1557256564 is 4656527551.

It can be written as a sum of positive squares in only one way, i.e., 964723600 + 592532964 = 31060^2 + 24342^2 .

It is a super-2 number, since 2×1557256564² = 4850096012242172192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194657067 + ... + 194657074.

Almost surely, 2^1557256564 is an apocalyptic number.

It is an amenable number.

1557256564 is a deficient number, since it is larger than the sum of its proper divisors (1167942430).

1557256564 is a wasteful number, since it uses less digits than its factorization.

1557256564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389314145 (or 389314143 counting only the distinct ones).

The product of its digits is 1260000, while the sum is 46.

The square root of 1557256564 is about 39462.0902132667. The cubic root of 1557256564 is about 1159.0977337795.

It can be divided in two parts, 1557 and 256564, that added together give a triangular number (258121 = T₇₁₈).

The spelling of 1557256564 in words is "one billion, five hundred fifty-seven million, two hundred fifty-six thousand, five hundred sixty-four".