9978263657 has 8 divisors (see below), whose sum is σ = 9999110880. Its totient is φ = 9957435040.

The previous prime is 9978263651. The next prime is 9978263677. The reversal of 9978263657 is 7563628799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9978263657 - 2⁶ = 9978263593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9978263657.

It is not an unprimeable number, because it can be changed into a prime (9978263651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605518 + ... + 1611720.

It is an arithmetic number, because the mean of its divisors is an integer number (1249888860).

Almost surely, 2^9978263657 is an apocalyptic number.

It is an amenable number.

9978263657 is a deficient number, since it is larger than the sum of its proper divisors (20847223).

9978263657 is a wasteful number, since it uses less digits than its factorization.

9978263657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9303.

The product of its digits is 34292160, while the sum is 62.

The square root of 9978263657 is about 99891.2591621509. The cubic root of 9978263657 is about 2152.8725732813.

The spelling of 9978263657 in words is "nine billion, nine hundred seventy-eight million, two hundred sixty-three thousand, six hundred fifty-seven".