16866509975 has 12 divisors (see below), whose sum is σ = 23902254384. Its totient is φ = 11565606720.

The previous prime is 16866509971. The next prime is 16866509981. The reversal of 16866509975 is 57990566861.

It is not a de Polignac number, because 16866509975 - 2² = 16866509971 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16866509971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48189854 + ... + 48190203.

It is an arithmetic number, because the mean of its divisors is an integer number (1991854532).

Almost surely, 2^16866509975 is an apocalyptic number.

16866509975 is a deficient number, since it is larger than the sum of its proper divisors (7035744409).

16866509975 is an equidigital number, since it uses as much as digits as its factorization.

16866509975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96380074 (or 96380069 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 62.

The spelling of 16866509975 in words is "sixteen billion, eight hundred sixty-six million, five hundred nine thousand, nine hundred seventy-five".