681475742527 has 2 divisors, whose sum is σ = 681475742528. Its totient is φ = 681475742526.

The previous prime is 681475742509. The next prime is 681475742537. The reversal of 681475742527 is 725247574186.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681475742527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681475742537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340737871263 + 340737871264.

It is an arithmetic number, because the mean of its divisors is an integer number (340737871264).

Almost surely, 2^681475742527 is an apocalyptic number.

681475742527 is a deficient number, since it is larger than the sum of its proper divisors (1).

681475742527 is an equidigital number, since it uses as much as digits as its factorization.

681475742527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26342400, while the sum is 58.

The spelling of 681475742527 in words is "six hundred eighty-one billion, four hundred seventy-five million, seven hundred forty-two thousand, five hundred twenty-seven".