56671689377 has 2 divisors, whose sum is σ = 56671689378. Its totient is φ = 56671689376.

The previous prime is 56671689359. The next prime is 56671689457. The reversal of 56671689377 is 77398617665.

56671689377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55431522721 + 1240166656 = 235439^2 + 35216^2 .

It is a cyclic number.

It is not a de Polignac number, because 56671689377 - 2²⁰ = 56670640801 is a prime.

It is not a weakly prime, because it can be changed into another prime (56671689317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28335844688 + 28335844689.

It is an arithmetic number, because the mean of its divisors is an integer number (28335844689).

Almost surely, 2^56671689377 is an apocalyptic number.

It is an amenable number.

56671689377 is a deficient number, since it is larger than the sum of its proper divisors (1).

56671689377 is an equidigital number, since it uses as much as digits as its factorization.

56671689377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80015040, while the sum is 65.

The spelling of 56671689377 in words is "fifty-six billion, six hundred seventy-one million, six hundred eighty-nine thousand, three hundred seventy-seven".