15511661616011 has 4 divisors (see below), whose sum is σ = 16921812672024. Its totient is φ = 14101510560000.

The previous prime is 15511661616007. The next prime is 15511661616013. The reversal of 15511661616011 is 11061616611551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15511661616011 - 2² = 15511661616007 is a prime.

It is a super-2 number, since 2×15511661616011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15511661616011.

It is not an unprimeable number, because it can be changed into a prime (15511661616013) 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, 705075527990 + ... + 705075528011.

It is an arithmetic number, because the mean of its divisors is an integer number (4230453168006).

Almost surely, 2^{15511661616011} is an apocalyptic number.

15511661616011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15511661616011 is a deficient number, since it is larger than the sum of its proper divisors (1410151056013).

15511661616011 is a wasteful number, since it uses less digits than its factorization.

15511661616011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410151056012.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 15511661616011 in words is "fifteen trillion, five hundred eleven billion, six hundred sixty-one million, six hundred sixteen thousand, eleven".