8400885491987 has 2 divisors, whose sum is σ = 8400885491988. Its totient is φ = 8400885491986.

The previous prime is 8400885491963. The next prime is 8400885491989. The reversal of 8400885491987 is 7891945880048.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8400885491987 is a prime.

Together with 8400885491989, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8400885491987.

It is not a weakly prime, because it can be changed into another prime (8400885491989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200442745993 + 4200442745994.

It is an arithmetic number, because the mean of its divisors is an integer number (4200442745994).

Almost surely, 2^{8400885491987} is an apocalyptic number.

8400885491987 is a deficient number, since it is larger than the sum of its proper divisors (1).

8400885491987 is an equidigital number, since it uses as much as digits as its factorization.

8400885491987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185794560, while the sum is 71.

The spelling of 8400885491987 in words is "eight trillion, four hundred billion, eight hundred eighty-five million, four hundred ninety-one thousand, nine hundred eighty-seven".