10438865666999 has 16 divisors (see below), whose sum is σ = 13014776232960. Its totient is φ = 8134126932960.

The previous prime is 10438865666989. The next prime is 10438865667011. The reversal of 10438865666999 is 99966656883401.

It is a happy number.

It is not a de Polignac number, because 10438865666999 - 2²⁰ = 10438864618423 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 (10438865666959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14323637 + ... + 15034769.

It is an arithmetic number, because the mean of its divisors is an integer number (813423514560).

Almost surely, 2^{10438865666999} is an apocalyptic number.

10438865666999 is a deficient number, since it is larger than the sum of its proper divisors (2575910565961).

10438865666999 is a wasteful number, since it uses less digits than its factorization.

10438865666999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901790.

The product of its (nonzero) digits is 3627970560, while the sum is 80.

The spelling of 10438865666999 in words is "ten trillion, four hundred thirty-eight billion, eight hundred sixty-five million, six hundred sixty-six thousand, nine hundred ninety-nine".