999718019851 has 2 divisors, whose sum is σ = 999718019852. Its totient is φ = 999718019850.

The previous prime is 999718019819. The next prime is 999718019857. The reversal of 999718019851 is 158910817999.

999718019851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999718019851 - 2⁵ = 999718019819 is a prime.

It is a super-2 number, since 2×999718019851² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999718019857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499859009925 + 499859009926.

It is an arithmetic number, because the mean of its divisors is an integer number (499859009926).

Almost surely, 2^999718019851 is an apocalyptic number.

999718019851 is a deficient number, since it is larger than the sum of its proper divisors (1).

999718019851 is an equidigital number, since it uses as much as digits as its factorization.

999718019851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 67.

The spelling of 999718019851 in words is "nine hundred ninety-nine billion, seven hundred eighteen million, nineteen thousand, eight hundred fifty-one".