678081134569 has 2 divisors, whose sum is σ = 678081134570. Its totient is φ = 678081134568.

The previous prime is 678081134561. The next prime is 678081134609. The reversal of 678081134569 is 965431180876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465294515625 + 212786618944 = 682125^2 + 461288^2 .

It is a cyclic number.

It is not a de Polignac number, because 678081134569 - 2³ = 678081134561 is a prime.

It is a super-2 number, since 2×678081134569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678081134561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339040567284 + 339040567285.

It is an arithmetic number, because the mean of its divisors is an integer number (339040567285).

Almost surely, 2^678081134569 is an apocalyptic number.

It is an amenable number.

678081134569 is a deficient number, since it is larger than the sum of its proper divisors (1).

678081134569 is an equidigital number, since it uses as much as digits as its factorization.

678081134569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 678081134569 in words is "six hundred seventy-eight billion, eighty-one million, one hundred thirty-four thousand, five hundred sixty-nine".