678581091137 has 2 divisors, whose sum is σ = 678581091138. Its totient is φ = 678581091136.

The previous prime is 678581091037. The next prime is 678581091157. The reversal of 678581091137 is 731190185876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631287455296 + 47293635841 = 794536^2 + 217471^2 .

It is a cyclic number.

It is not a de Polignac number, because 678581091137 - 2⁸ = 678581090881 is a prime.

It is not a weakly prime, because it can be changed into another prime (678581091157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339290545568 + 339290545569.

It is an arithmetic number, because the mean of its divisors is an integer number (339290545569).

Almost surely, 2^678581091137 is an apocalyptic number.

It is an amenable number.

678581091137 is a deficient number, since it is larger than the sum of its proper divisors (1).

678581091137 is an equidigital number, since it uses as much as digits as its factorization.

678581091137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The spelling of 678581091137 in words is "six hundred seventy-eight billion, five hundred eighty-one million, ninety-one thousand, one hundred thirty-seven".