1555612643 has 16 divisors (see below), whose sum is σ = 1750189056. Its totient is φ = 1372857120.

The previous prime is 1555612601. The next prime is 1555612649. The reversal of 1555612643 is 3462165551.

It is a cyclic number.

It is not a de Polignac number, because 1555612643 - 2¹⁰ = 1555611619 is a prime.

It is a super-2 number, since 2×1555612643² = 4839861390122890898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1555612597 and 1555612606.

It is not an unprimeable number, because it can be changed into a prime (1555612649) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 10196 + ... + 56702.

It is an arithmetic number, because the mean of its divisors is an integer number (109386816).

Almost surely, 2^1555612643 is an apocalyptic number.

1555612643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1555612643 is a deficient number, since it is larger than the sum of its proper divisors (194576413).

1555612643 is a wasteful number, since it uses less digits than its factorization.

1555612643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46634.

The product of its digits is 108000, while the sum is 38.

The square root of 1555612643 is about 39441.2555961394. The cubic root of 1555612643 is about 1158.6897222277.

The spelling of 1555612643 in words is "one billion, five hundred fifty-five million, six hundred twelve thousand, six hundred forty-three".