17881885997 has 2 divisors, whose sum is σ = 17881885998. Its totient is φ = 17881885996.

The previous prime is 17881885951. The next prime is 17881886051. The reversal of 17881885997 is 79958818871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16176278596 + 1705607401 = 127186^2 + 41299^2 .

It is a cyclic number.

It is not a de Polignac number, because 17881885997 - 2⁸ = 17881885741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17881885997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17881885927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8940942998 + 8940942999.

It is an arithmetic number, because the mean of its divisors is an integer number (8940942999).

Almost surely, 2^17881885997 is an apocalyptic number.

It is an amenable number.

17881885997 is a deficient number, since it is larger than the sum of its proper divisors (1).

17881885997 is an equidigital number, since it uses as much as digits as its factorization.

17881885997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 71.

The spelling of 17881885997 in words is "seventeen billion, eight hundred eighty-one million, eight hundred eighty-five thousand, nine hundred ninety-seven".