6945687457 has 2 divisors, whose sum is σ = 6945687458. Its totient is φ = 6945687456.

The previous prime is 6945687439. The next prime is 6945687517. The reversal of 6945687457 is 7547865496.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6510714721 + 434972736 = 80689^2 + 20856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6945687457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6945687395 and 6945687404.

It is not a weakly prime, because it can be changed into another prime (6945688457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3472843728 + 3472843729.

It is an arithmetic number, because the mean of its divisors is an integer number (3472843729).

Almost surely, 2^6945687457 is an apocalyptic number.

It is an amenable number.

6945687457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6945687457 is an equidigital number, since it uses as much as digits as its factorization.

6945687457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50803200, while the sum is 61.

The square root of 6945687457 is about 83340.7910749592. The cubic root of 6945687457 is about 1907.9708956653.

The spelling of 6945687457 in words is "six billion, nine hundred forty-five million, six hundred eighty-seven thousand, four hundred fifty-seven".