56667691573 has 2 divisors, whose sum is σ = 56667691574. Its totient is φ = 56667691572.

The previous prime is 56667691567. The next prime is 56667691631. The reversal of 56667691573 is 37519676665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50094049489 + 6573642084 = 223817^2 + 81078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56667691573 is a prime.

It is a super-2 number, since 2×56667691573² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56667691543) 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 as a sum of consecutive naturals, namely, 28333845786 + 28333845787.

It is an arithmetic number, because the mean of its divisors is an integer number (28333845787).

Almost surely, 2^56667691573 is an apocalyptic number.

It is an amenable number.

56667691573 is a deficient number, since it is larger than the sum of its proper divisors (1).

56667691573 is an equidigital number, since it uses as much as digits as its factorization.

56667691573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42865200, while the sum is 61.

The spelling of 56667691573 in words is "fifty-six billion, six hundred sixty-seven million, six hundred ninety-one thousand, five hundred seventy-three".