19854258157 has 2 divisors, whose sum is σ = 19854258158. Its totient is φ = 19854258156.

The previous prime is 19854258131. The next prime is 19854258173. The reversal of 19854258157 is 75185245891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10893931876 + 8960326281 = 104374^2 + 94659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19854258157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19854258098 and 19854258107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19854258757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927129078 + 9927129079.

It is an arithmetic number, because the mean of its divisors is an integer number (9927129079).

Almost surely, 2^19854258157 is an apocalyptic number.

It is an amenable number.

19854258157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19854258157 is an equidigital number, since it uses as much as digits as its factorization.

19854258157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 55.

The spelling of 19854258157 in words is "nineteen billion, eight hundred fifty-four million, two hundred fifty-eight thousand, one hundred fifty-seven".