1556745361 has 8 divisors (see below), whose sum is σ = 1584270144. Its totient is φ = 1529376240.

The previous prime is 1556745349. The next prime is 1556745389. The reversal of 1556745361 is 1635476551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1556745361 - 2¹⁷ = 1556614289 is a prime.

It is a super-2 number, since 2×1556745361² = 4846912237990040642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1556745331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18646 + ... + 58831.

It is an arithmetic number, because the mean of its divisors is an integer number (198033768).

Almost surely, 2^1556745361 is an apocalyptic number.

It is an amenable number.

1556745361 is a deficient number, since it is larger than the sum of its proper divisors (27524783).

1556745361 is an equidigital number, since it uses as much as digits as its factorization.

1556745361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77831.

The product of its digits is 378000, while the sum is 43.

The square root of 1556745361 is about 39455.6125411835. The cubic root of 1556745361 is about 1158.9708869683.

The spelling of 1556745361 in words is "one billion, five hundred fifty-six million, seven hundred forty-five thousand, three hundred sixty-one".