7899757849 has 2 divisors, whose sum is σ = 7899757850. Its totient is φ = 7899757848.

The previous prime is 7899757837. The next prime is 7899757907. The reversal of 7899757849 is 9487579987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7722015625 + 177742224 = 87875^2 + 13332^2 .

It is an emirp because it is prime and its reverse (9487579987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7899757849 - 2⁹ = 7899757337 is a prime.

It is not a weakly prime, because it can be changed into another prime (7899752849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949878924 + 3949878925.

It is an arithmetic number, because the mean of its divisors is an integer number (3949878925).

Almost surely, 2^7899757849 is an apocalyptic number.

It is an amenable number.

7899757849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7899757849 is an equidigital number, since it uses as much as digits as its factorization.

7899757849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320060160, while the sum is 73.

The square root of 7899757849 is about 88880.5819569157. The cubic root of 7899757849 is about 1991.6113519002.

The spelling of 7899757849 in words is "seven billion, eight hundred ninety-nine million, seven hundred fifty-seven thousand, eight hundred forty-nine".