999874757881 has 2 divisors, whose sum is σ = 999874757882. Its totient is φ = 999874757880.

The previous prime is 999874757813. The next prime is 999874757887. The reversal of 999874757881 is 188757478999.

999874757881 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 can be written as a sum of positive squares in only one way, i.e., 973150682256 + 26724075625 = 986484^2 + 163475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999874757881 is a prime.

It is a super-2 number, since 2×999874757881² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999874757795 and 999874757804.

It is not a weakly prime, because it can be changed into another prime (999874757887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499937378940 + 499937378941.

It is an arithmetic number, because the mean of its divisors is an integer number (499937378941).

Almost surely, 2^999874757881 is an apocalyptic number.

It is an amenable number.

999874757881 is a deficient number, since it is larger than the sum of its proper divisors (1).

999874757881 is an equidigital number, since it uses as much as digits as its factorization.

999874757881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560481280, while the sum is 82.

The spelling of 999874757881 in words is "nine hundred ninety-nine billion, eight hundred seventy-four million, seven hundred fifty-seven thousand, eight hundred eighty-one".