11662881400666 has 8 divisors (see below), whose sum is σ = 18523399871700. Its totient is φ = 5488414776768.

The previous prime is 11662881400657. The next prime is 11662881400693. The reversal of 11662881400666 is 66600418826611.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11620292411025 + 42588989641 = 3408855^2 + 206371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171512961741 + ... + 171512961808.

Almost surely, 2^{11662881400666} is an apocalyptic number.

11662881400666 is a deficient number, since it is larger than the sum of its proper divisors (6860518471034).

11662881400666 is a wasteful number, since it uses less digits than its factorization.

11662881400666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343025923568.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 11662881400666 in words is "eleven trillion, six hundred sixty-two billion, eight hundred eighty-one million, four hundred thousand, six hundred sixty-six".