7648751977 has 2 divisors, whose sum is σ = 7648751978. Its totient is φ = 7648751976.

The previous prime is 7648751963. The next prime is 7648751987. The reversal of 7648751977 is 7791578467.

7648751977 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7200540736 + 448211241 = 84856^2 + 21171^2 .

It is a cyclic number.

It is not a de Polignac number, because 7648751977 - 2¹⁹ = 7648227689 is a prime.

It is a super-2 number, since 2×7648751977² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7648751987) 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, 3824375988 + 3824375989.

It is an arithmetic number, because the mean of its divisors is an integer number (3824375989).

Almost surely, 2^7648751977 is an apocalyptic number.

It is an amenable number.

7648751977 is a deficient number, since it is larger than the sum of its proper divisors (1).

7648751977 is an equidigital number, since it uses as much as digits as its factorization.

7648751977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20744640, while the sum is 61.

The square root of 7648751977 is about 87457.1436590517. The cubic root of 7648751977 is about 1970.2901800551.

The spelling of 7648751977 in words is "seven billion, six hundred forty-eight million, seven hundred fifty-one thousand, nine hundred seventy-seven".