1557382664 has 16 divisors (see below), whose sum is σ = 2920729020. Its totient is φ = 778521600.

The previous prime is 1557382573. The next prime is 1557382691. The reversal of 1557382664 is 4662837551.

It can be written as a sum of positive squares in 2 ways, for example, as 1556933764 + 448900 = 39458^2 + 670^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23264 + ... + 60464.

Almost surely, 2^1557382664 is an apocalyptic number.

It is an amenable number.

1557382664 is a deficient number, since it is larger than the sum of its proper divisors (1363346356).

1557382664 is a wasteful number, since it uses less digits than its factorization.

1557382664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42440 (or 42436 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The square root of 1557382664 is about 39463.6879168686. The cubic root of 1557382664 is about 1159.1290192000.

The spelling of 1557382664 in words is "one billion, five hundred fifty-seven million, three hundred eighty-two thousand, six hundred sixty-four".