56219661 has 24 divisors (see below), whose sum is σ = 85812480. Its totient is φ = 35409696.

The previous prime is 56219641. The next prime is 56219699. The reversal of 56219661 is 16691265.

56219661 is a `hidden beast` number, since 562 + 1 + 96 + 6 + 1 = 666.

56219661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56219661 - 2¹⁹ = 55695373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56219641) 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 23 ways as a sum of consecutive naturals, for example, 9976 + ... + 14558.

It is an arithmetic number, because the mean of its divisors is an integer number (3575520).

Almost surely, 2^56219661 is an apocalyptic number.

It is an amenable number.

56219661 is a deficient number, since it is larger than the sum of its proper divisors (29592819).

56219661 is a wasteful number, since it uses less digits than its factorization.

56219661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665 (or 4662 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 56219661 is about 7497.9771271990. The cubic root of 56219661 is about 383.0858176990.

The spelling of 56219661 in words is "fifty-six million, two hundred nineteen thousand, six hundred sixty-one".