16866640945 has 64 divisors (see below), whose sum is σ = 26593505280. Its totient is φ = 9957024000.

The previous prime is 16866640927. The next prime is 16866640951. The reversal of 16866640945 is 54904666861.

It is not a de Polignac number, because 16866640945 - 2⁹ = 16866640433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 884926 + ... + 903784.

It is an arithmetic number, because the mean of its divisors is an integer number (415523520).

Almost surely, 2^16866640945 is an apocalyptic number.

It is an amenable number.

16866640945 is a deficient number, since it is larger than the sum of its proper divisors (9726864335).

16866640945 is a wasteful number, since it uses less digits than its factorization.

16866640945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19006.

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 16866640945 in words is "sixteen billion, eight hundred sixty-six million, six hundred forty thousand, nine hundred forty-five".