9978263677 has 2 divisors, whose sum is σ = 9978263678. Its totient is φ = 9978263676.

The previous prime is 9978263651. The next prime is 9978263681. The reversal of 9978263677 is 7763628799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8954647641 + 1023616036 = 94629^2 + 31994^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978263677 - 2¹⁹ = 9977739389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9978263177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989131838 + 4989131839.

It is an arithmetic number, because the mean of its divisors is an integer number (4989131839).

Almost surely, 2^9978263677 is an apocalyptic number.

It is an amenable number.

9978263677 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978263677 is an equidigital number, since it uses as much as digits as its factorization.

9978263677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48009024, while the sum is 64.

The square root of 9978263677 is about 99891.2592622598. The cubic root of 9978263677 is about 2152.8725747197.

The spelling of 9978263677 in words is "nine billion, nine hundred seventy-eight million, two hundred sixty-three thousand, six hundred seventy-seven".