999724132194157 has 2 divisors, whose sum is σ = 999724132194158. Its totient is φ = 999724132194156.

The previous prime is 999724132194071. The next prime is 999724132194163. The reversal of 999724132194157 is 751491231427999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 928438633624681 + 71285498569476 = 30470291^2 + 8443074^2 .

It is a cyclic number.

It is not a de Polignac number, because 999724132194157 - 2²³ = 999724123805549 is a prime.

It is a super-2 number, since 2×999724132194157² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999724132194157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999724132195157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499862066097078 + 499862066097079.

It is an arithmetic number, because the mean of its divisors is an integer number (499862066097079).

Almost surely, 2^{999724132194157} is an apocalyptic number.

It is an amenable number.

999724132194157 is a deficient number, since it is larger than the sum of its proper divisors (1).

999724132194157 is an equidigital number, since it uses as much as digits as its factorization.

999724132194157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 308629440, while the sum is 73.

The spelling of 999724132194157 in words is "nine hundred ninety-nine trillion, seven hundred twenty-four billion, one hundred thirty-two million, one hundred ninety-four thousand, one hundred fifty-seven".