556552261 has 16 divisors (see below), whose sum is σ = 580239936. Its totient is φ = 533385216.

The previous prime is 556552231. The next prime is 556552279. The reversal of 556552261 is 162255655.

It is a cyclic number.

It is not a de Polignac number, because 556552261 - 2¹⁵ = 556519493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 556552261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556552201) 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, 1017190 + ... + 1017736.

It is an arithmetic number, because the mean of its divisors is an integer number (36264996).

Almost surely, 2^556552261 is an apocalyptic number.

It is an amenable number.

556552261 is a deficient number, since it is larger than the sum of its proper divisors (23687675).

556552261 is a wasteful number, since it uses less digits than its factorization.

556552261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its digits is 90000, while the sum is 37.

The square root of 556552261 is about 23591.3598802612. The cubic root of 556552261 is about 822.5620151379.

The spelling of 556552261 in words is "five hundred fifty-six million, five hundred fifty-two thousand, two hundred sixty-one".