19201819157 has 2 divisors, whose sum is σ = 19201819158. Its totient is φ = 19201819156.

The previous prime is 19201819127. The next prime is 19201819199. The reversal of 19201819157 is 75191810291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13136368996 + 6065450161 = 114614^2 + 77881^2 .

It is a cyclic number.

It is not a de Polignac number, because 19201819157 - 2¹⁸ = 19201557013 is a prime.

It is a super-3 number, since 3×19201819157³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19201819127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9600909578 + 9600909579.

It is an arithmetic number, because the mean of its divisors is an integer number (9600909579).

Almost surely, 2^19201819157 is an apocalyptic number.

It is an amenable number.

19201819157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19201819157 is an equidigital number, since it uses as much as digits as its factorization.

19201819157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 44.

The spelling of 19201819157 in words is "nineteen billion, two hundred one million, eight hundred nineteen thousand, one hundred fifty-seven".