2156556513 has 8 divisors (see below), whose sum is σ = 2875637376. Its totient is φ = 1437590000.

The previous prime is 2156556469. The next prime is 2156556527. The reversal of 2156556513 is 3156556512.

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 2156556513 - 2⁸ = 2156556257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2156556113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36763 + ... + 75263.

It is an arithmetic number, because the mean of its divisors is an integer number (359454672).

Almost surely, 2^2156556513 is an apocalyptic number.

It is an amenable number.

2156556513 is a deficient number, since it is larger than the sum of its proper divisors (719080863).

2156556513 is a wasteful number, since it uses less digits than its factorization.

2156556513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57175.

The product of its digits is 135000, while the sum is 39.

The square root of 2156556513 is about 46438.7393562745. The cubic root of 2156556513 is about 1291.9735257142.

Subtracting 2156556513 from its reverse (3156556512), we obtain a palindrome (999999999).

The spelling of 2156556513 in words is "two billion, one hundred fifty-six million, five hundred fifty-six thousand, five hundred thirteen".