11551561649999 has 8 divisors (see below), whose sum is σ = 13202388538368. Its totient is φ = 9900885710520.

The previous prime is 11551561649959. The next prime is 11551561650017. The reversal of 11551561649999 is 99994616515511.

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

It is not a de Polignac number, because 11551561649999 - 2¹² = 11551561645903 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 (11551561649959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37573187 + ... + 37879380.

It is an arithmetic number, because the mean of its divisors is an integer number (1650298567296).

Almost surely, 2^{11551561649999} is an apocalyptic number.

11551561649999 is a deficient number, since it is larger than the sum of its proper divisors (1650826888369).

11551561649999 is an equidigital number, since it uses as much as digits as its factorization.

11551561649999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75474445.

The product of its digits is 118098000, while the sum is 71.

The spelling of 11551561649999 in words is "eleven trillion, five hundred fifty-one billion, five hundred sixty-one million, six hundred forty-nine thousand, nine hundred ninety-nine".