816957143987 has 2 divisors, whose sum is σ = 816957143988. Its totient is φ = 816957143986.

The previous prime is 816957143963. The next prime is 816957144071. The reversal of 816957143987 is 789341759618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816957143987 - 2⁸ = 816957143731 is a prime.

It is a super-2 number, since 2×816957143987² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (816957143687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408478571993 + 408478571994.

It is an arithmetic number, because the mean of its divisors is an integer number (408478571994).

Almost surely, 2^816957143987 is an apocalyptic number.

816957143987 is a deficient number, since it is larger than the sum of its proper divisors (1).

816957143987 is an equidigital number, since it uses as much as digits as its factorization.

816957143987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 68.

The spelling of 816957143987 in words is "eight hundred sixteen billion, nine hundred fifty-seven million, one hundred forty-three thousand, nine hundred eighty-seven".