56661261 has 8 divisors (see below), whose sum is σ = 75597504. Its totient is φ = 37749600.

The previous prime is 56661247. The next prime is 56661271. The reversal of 56661261 is 16216665.

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

It is not a de Polignac number, because 56661261 - 2¹⁷ = 56530189 is a prime.

It is a super-2 number, since 2×56661261² = 6420996996220242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661271) 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, 160 + ... + 10646.

It is an arithmetic number, because the mean of its divisors is an integer number (9449688).

Almost surely, 2^56661261 is an apocalyptic number.

It is an amenable number.

56661261 is a deficient number, since it is larger than the sum of its proper divisors (18936243).

56661261 is a wasteful number, since it uses less digits than its factorization.

56661261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12291.

The product of its digits is 12960, while the sum is 33.

The square root of 56661261 is about 7527.3674681126. The cubic root of 56661261 is about 384.0862368710.

The spelling of 56661261 in words is "fifty-six million, six hundred sixty-one thousand, two hundred sixty-one".