678591275981 has 2 divisors, whose sum is σ = 678591275982. Its totient is φ = 678591275980.

The previous prime is 678591275941. The next prime is 678591276001. The reversal of 678591275981 is 189572195876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597784117225 + 80807158756 = 773165^2 + 284266^2 .

It is a cyclic number.

It is not a de Polignac number, because 678591275981 - 2¹⁴ = 678591259597 is a prime.

It is a super-2 number, since 2×678591275981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678591275941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339295637990 + 339295637991.

It is an arithmetic number, because the mean of its divisors is an integer number (339295637991).

Almost surely, 2^678591275981 is an apocalyptic number.

It is an amenable number.

678591275981 is a deficient number, since it is larger than the sum of its proper divisors (1).

678591275981 is an equidigital number, since it uses as much as digits as its factorization.

678591275981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 68.

The spelling of 678591275981 in words is "six hundred seventy-eight billion, five hundred ninety-one million, two hundred seventy-five thousand, nine hundred eighty-one".