11999990001001 has 4 divisors (see below), whose sum is σ = 12279059535952. Its totient is φ = 11720920466052.

The previous prime is 11999990000993. The next prime is 11999990001023. The reversal of 11999990001001 is 10010009999911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11999990001001 - 2³ = 11999990000993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11999990001061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139534767411 + ... + 139534767496.

It is an arithmetic number, because the mean of its divisors is an integer number (3069764883988).

Almost surely, 2^{11999990001001} is an apocalyptic number.

It is an amenable number.

11999990001001 is a deficient number, since it is larger than the sum of its proper divisors (279069534951).

11999990001001 is an equidigital number, since it uses as much as digits as its factorization.

11999990001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279069534950.

The product of its (nonzero) digits is 59049, while the sum is 49.

The spelling of 11999990001001 in words is "eleven trillion, nine hundred ninety-nine billion, nine hundred ninety million, one thousand, one".