16863551987 has 2 divisors, whose sum is σ = 16863551988. Its totient is φ = 16863551986.

The previous prime is 16863551911. The next prime is 16863552023. The reversal of 16863551987 is 78915536861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16863551987 - 2¹² = 16863547891 is a prime.

It is not a weakly prime, because it can be changed into another prime (16863554987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8431775993 + 8431775994.

It is an arithmetic number, because the mean of its divisors is an integer number (8431775994).

Almost surely, 2^16863551987 is an apocalyptic number.

16863551987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16863551987 is an equidigital number, since it uses as much as digits as its factorization.

16863551987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 59.

The spelling of 16863551987 in words is "sixteen billion, eight hundred sixty-three million, five hundred fifty-one thousand, nine hundred eighty-seven".