19779288157 has 2 divisors, whose sum is σ = 19779288158. Its totient is φ = 19779288156.

The previous prime is 19779288149. The next prime is 19779288187. The reversal of 19779288157 is 75188297791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11610924516 + 8168363641 = 107754^2 + 90379^2 .

It is a cyclic number.

It is not a de Polignac number, because 19779288157 - 2³ = 19779288149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19779288187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9889644078 + 9889644079.

It is an arithmetic number, because the mean of its divisors is an integer number (9889644079).

Almost surely, 2^19779288157 is an apocalyptic number.

It is an amenable number.

19779288157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19779288157 is an equidigital number, since it uses as much as digits as its factorization.

19779288157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17781120, while the sum is 64.

The spelling of 19779288157 in words is "nineteen billion, seven hundred seventy-nine million, two hundred eighty-eight thousand, one hundred fifty-seven".