1556009649 has 16 divisors (see below), whose sum is σ = 2315102400. Its totient is φ = 1032883488.

The previous prime is 1556009647. The next prime is 1556009671. The reversal of 1556009649 is 9469006551.

It is a happy number.

1556009649 is a `hidden beast` number, since 1 + 556 + 0 + 0 + 96 + 4 + 9 = 666.

It is not a de Polignac number, because 1556009649 - 2¹ = 1556009647 is a prime.

It is a super-2 number, since 2×1556009649² = 4842332055562206402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1556009647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117379 + ... + 129960.

It is an arithmetic number, because the mean of its divisors is an integer number (144693900).

Almost surely, 2^1556009649 is an apocalyptic number.

It is an amenable number.

1556009649 is a deficient number, since it is larger than the sum of its proper divisors (759092751).

1556009649 is a wasteful number, since it uses less digits than its factorization.

1556009649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247581 (or 247575 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 1556009649 is about 39446.2881523725. The cubic root of 1556009649 is about 1158.7882831059.

The spelling of 1556009649 in words is "one billion, five hundred fifty-six million, nine thousand, six hundred forty-nine".