7426994857 has 2 divisors, whose sum is σ = 7426994858. Its totient is φ = 7426994856.

The previous prime is 7426994851. The next prime is 7426994893. The reversal of 7426994857 is 7584996247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6958229056 + 468765801 = 83416^2 + 21651^2 .

It is an emirp because it is prime and its reverse (7584996247) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7426994857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7426994795 and 7426994804.

It is not a weakly prime, because it can be changed into another prime (7426994851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3713497428 + 3713497429.

It is an arithmetic number, because the mean of its divisors is an integer number (3713497429).

Almost surely, 2^7426994857 is an apocalyptic number.

It is an amenable number.

7426994857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7426994857 is an equidigital number, since it uses as much as digits as its factorization.

7426994857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 61.

The square root of 7426994857 is about 86180.0142550464. The cubic root of 7426994857 is about 1951.0618680302.

The spelling of 7426994857 in words is "seven billion, four hundred twenty-six million, nine hundred ninety-four thousand, eight hundred fifty-seven".