56672021893 has 2 divisors, whose sum is σ = 56672021894. Its totient is φ = 56672021892.

The previous prime is 56672021881. The next prime is 56672021921. The reversal of 56672021893 is 39812027665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45508408929 + 11163612964 = 213327^2 + 105658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56672021893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56672021863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28336010946 + 28336010947.

It is an arithmetic number, because the mean of its divisors is an integer number (28336010947).

Almost surely, 2^56672021893 is an apocalyptic number.

It is an amenable number.

56672021893 is a deficient number, since it is larger than the sum of its proper divisors (1).

56672021893 is an equidigital number, since it uses as much as digits as its factorization.

56672021893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 56672021893 in words is "fifty-six billion, six hundred seventy-two million, twenty-one thousand, eight hundred ninety-three".