1679358565681 has 2 divisors, whose sum is σ = 1679358565682. Its totient is φ = 1679358565680.

The previous prime is 1679358565657. The next prime is 1679358565721. The reversal of 1679358565681 is 1865658539761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1679266098225 + 92467456 = 1295865^2 + 9616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679358565681 - 2⁵ = 1679358565649 is a prime.

It is a super-2 number, since 2×1679358565681² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1679358565681.

It is not a weakly prime, because it can be changed into another prime (1679388565681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839679282840 + 839679282841.

It is an arithmetic number, because the mean of its divisors is an integer number (839679282841).

Almost surely, 2^{1679358565681} is an apocalyptic number.

It is an amenable number.

1679358565681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679358565681 is an equidigital number, since it uses as much as digits as its factorization.

1679358565681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592000, while the sum is 70.

The spelling of 1679358565681 in words is "one trillion, six hundred seventy-nine billion, three hundred fifty-eight million, five hundred sixty-five thousand, six hundred eighty-one".