11661631999 has 8 divisors (see below), whose sum is σ = 11714582880. Its totient is φ = 11608780800.

The previous prime is 11661631951. The next prime is 11661632011. The reversal of 11661631999 is 99913616611.

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

It is a cyclic number.

It is not a de Polignac number, because 11661631999 - 2¹⁵ = 11661599231 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 (11661631909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214779 + ... + 263539.

It is an arithmetic number, because the mean of its divisors is an integer number (1464322860).

Almost surely, 2^11661631999 is an apocalyptic number.

11661631999 is a deficient number, since it is larger than the sum of its proper divisors (52950881).

11661631999 is an equidigital number, since it uses as much as digits as its factorization.

11661631999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49841.

The product of its digits is 472392, while the sum is 52.

The spelling of 11661631999 in words is "eleven billion, six hundred sixty-one million, six hundred thirty-one thousand, nine hundred ninety-nine".