1165521200666 has 8 divisors (see below), whose sum is σ = 1804677988224. Its totient is φ = 563961871260.

The previous prime is 1165521200647. The next prime is 1165521200677. The reversal of 1165521200666 is 6660021255611.

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

It is a Curzon number.

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, 9399364460 + ... + 9399364583.

It is an arithmetic number, because the mean of its divisors is an integer number (225584748528).

Almost surely, 2^{1165521200666} is an apocalyptic number.

1165521200666 is a deficient number, since it is larger than the sum of its proper divisors (639156787558).

1165521200666 is a wasteful number, since it uses less digits than its factorization.

1165521200666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18798729076.

The product of its (nonzero) digits is 129600, while the sum is 41.

Subtracting 1165521200666 from its reverse (6660021255611), we obtain a palindrome (5494500054945).

The spelling of 1165521200666 in words is "one trillion, one hundred sixty-five billion, five hundred twenty-one million, two hundred thousand, six hundred sixty-six".