11661165010999 has 16 divisors (see below), whose sum is σ = 13434113875968. Its totient is φ = 9915008154912.

The previous prime is 11661165010991. The next prime is 11661165011033. The reversal of 11661165010999 is 99901056116611.

It is not a de Polignac number, because 11661165010999 - 2³ = 11661165010991 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 (11661165010991) 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, 4583889 + ... + 6658405.

It is an arithmetic number, because the mean of its divisors is an integer number (839632117248).

Almost surely, 2^{11661165010999} is an apocalyptic number.

11661165010999 is a deficient number, since it is larger than the sum of its proper divisors (1772948864969).

11661165010999 is a wasteful number, since it uses less digits than its factorization.

11661165010999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080974.

The product of its (nonzero) digits is 787320, while the sum is 55.

The spelling of 11661165010999 in words is "eleven trillion, six hundred sixty-one billion, one hundred sixty-five million, ten thousand, nine hundred ninety-nine".