56667228391 has 4 divisors (see below), whose sum is σ = 56687491192. Its totient is φ = 56646965592.

The previous prime is 56667228383. The next prime is 56667228413. The reversal of 56667228391 is 19382276665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56667228391 - 2³ = 56667228383 is a prime.

It is a super-2 number, since 2×56667228391² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56667228691) 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 3 ways as a sum of consecutive naturals, for example, 10127205 + ... + 10132798.

It is an arithmetic number, because the mean of its divisors is an integer number (14171872798).

Almost surely, 2^56667228391 is an apocalyptic number.

56667228391 is a deficient number, since it is larger than the sum of its proper divisors (20262801).

56667228391 is a wasteful number, since it uses less digits than its factorization.

56667228391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20262800.

The product of its digits is 6531840, while the sum is 55.

The spelling of 56667228391 in words is "fifty-six billion, six hundred sixty-seven million, two hundred twenty-eight thousand, three hundred ninety-one".