7681759649 has 2 divisors, whose sum is σ = 7681759650. Its totient is φ = 7681759648.

The previous prime is 7681759637. The next prime is 7681759681. The reversal of 7681759649 is 9469571867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7394796049 + 286963600 = 85993^2 + 16940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7681759649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7681759591 and 7681759600.

It is not a weakly prime, because it can be changed into another prime (7681759609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840879824 + 3840879825.

It is an arithmetic number, because the mean of its divisors is an integer number (3840879825).

Almost surely, 2^7681759649 is an apocalyptic number.

It is an amenable number.

7681759649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681759649 is an equidigital number, since it uses as much as digits as its factorization.

7681759649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 62.

The square root of 7681759649 is about 87645.6482034334. The cubic root of 7681759649 is about 1973.1203308608.

The spelling of 7681759649 in words is "seven billion, six hundred eighty-one million, seven hundred fifty-nine thousand, six hundred forty-nine".