9993978023 has 2 divisors, whose sum is σ = 9993978024. Its totient is φ = 9993978022.

The previous prime is 9993977953. The next prime is 9993978067. The reversal of 9993978023 is 3208793999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9993978023 - 2¹⁰ = 9993976999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9993978223) 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 as a sum of consecutive naturals, namely, 4996989011 + 4996989012.

It is an arithmetic number, because the mean of its divisors is an integer number (4996989012).

Almost surely, 2^9993978023 is an apocalyptic number.

9993978023 is a deficient number, since it is larger than the sum of its proper divisors (1).

9993978023 is an equidigital number, since it uses as much as digits as its factorization.

9993978023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6613488, while the sum is 59.

The square root of 9993978023 is about 99969.8855806087. The cubic root of 9993978023 is about 2154.0021379879.

The spelling of 9993978023 in words is "nine billion, nine hundred ninety-three million, nine hundred seventy-eight thousand, twenty-three".