11621601999 has 36 divisors (see below), whose sum is σ = 20676140784. Its totient is φ = 6250269312.

The previous prime is 11621601919. The next prime is 11621602007. The reversal of 11621601999 is 99910612611.

11621601999 is a `hidden beast` number, since 1 + 1 + 621 + 6 + 0 + 19 + 9 + 9 = 666.

It is not a de Polignac number, because 11621601999 - 2⁸ = 11621601743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621601919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 767587 + ... + 782580.

It is an arithmetic number, because the mean of its divisors is an integer number (574337244).

Almost surely, 2^11621601999 is an apocalyptic number.

11621601999 is a deficient number, since it is larger than the sum of its proper divisors (9054538785).

11621601999 is a wasteful number, since it uses less digits than its factorization.

11621601999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550204 (or 1550194 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 11621601999 in words is "eleven billion, six hundred twenty-one million, six hundred one thousand, nine hundred ninety-nine".