18978483157 has 2 divisors, whose sum is σ = 18978483158. Its totient is φ = 18978483156.

The previous prime is 18978483119. The next prime is 18978483187. The reversal of 18978483157 is 75138487981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15859372356 + 3119110801 = 125934^2 + 55849^2 .

It is a cyclic number.

It is not a de Polignac number, because 18978483157 - 2³¹ = 16830999509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18978483095 and 18978483104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18978483187) 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, 9489241578 + 9489241579.

It is an arithmetic number, because the mean of its divisors is an integer number (9489241579).

Almost surely, 2^18978483157 is an apocalyptic number.

It is an amenable number.

18978483157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978483157 is an equidigital number, since it uses as much as digits as its factorization.

18978483157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 61.

The spelling of 18978483157 in words is "eighteen billion, nine hundred seventy-eight million, four hundred eighty-three thousand, one hundred fifty-seven".