11551515660001 has 4 divisors (see below), whose sum is σ = 11551680990000. Its totient is φ = 11551350330004.

The previous prime is 11551515659953. The next prime is 11551515660019. The reversal of 11551515660001 is 10006651515511.

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 11551515660001 - 2⁴¹ = 9352492404449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11551515660101) 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 3 ways as a sum of consecutive naturals, for example, 82560151 + ... + 82699948.

It is an arithmetic number, because the mean of its divisors is an integer number (2887920247500).

Almost surely, 2^{11551515660001} is an apocalyptic number.

It is an amenable number.

11551515660001 is a deficient number, since it is larger than the sum of its proper divisors (165329999).

11551515660001 is an equidigital number, since it uses as much as digits as its factorization.

11551515660001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165329998.

The product of its (nonzero) digits is 22500, while the sum is 37.

The spelling of 11551515660001 in words is "eleven trillion, five hundred fifty-one billion, five hundred fifteen million, six hundred sixty thousand, one".