7687501649 has 2 divisors, whose sum is σ = 7687501650. Its totient is φ = 7687501648.

The previous prime is 7687501621. The next prime is 7687501691. The reversal of 7687501649 is 9461057867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4232413249 + 3455088400 = 65057^2 + 58780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7687501649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7687501649.

It is not a weakly prime, because it can be changed into another prime (7687501699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3843750824 + 3843750825.

It is an arithmetic number, because the mean of its divisors is an integer number (3843750825).

Almost surely, 2^7687501649 is an apocalyptic number.

It is an amenable number.

7687501649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7687501649 is an equidigital number, since it uses as much as digits as its factorization.

7687501649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The square root of 7687501649 is about 87678.3989874359. The cubic root of 7687501649 is about 1973.6118343579.

The spelling of 7687501649 in words is "seven billion, six hundred eighty-seven million, five hundred one thousand, six hundred forty-nine".