11551516545505 has 8 divisors (see below), whose sum is σ = 14677221022632. Its totient is φ = 8697612457728.

The previous prime is 11551516545497. The next prime is 11551516545529. The reversal of 11551516545505 is 50554561515511.

It can be written as a sum of positive squares in 4 ways, for example, as 2792852619489 + 8758663926016 = 1671183^2 + 2959504^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11551516545505 - 2³ = 11551516545497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67950097242 + ... + 67950097411.

It is an arithmetic number, because the mean of its divisors is an integer number (1834652627829).

Almost surely, 2^{11551516545505} is an apocalyptic number.

It is an amenable number.

11551516545505 is a deficient number, since it is larger than the sum of its proper divisors (3125704477127).

11551516545505 is a wasteful number, since it uses less digits than its factorization.

11551516545505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135900194675.

The product of its (nonzero) digits is 1875000, while the sum is 49.

The spelling of 11551516545505 in words is "eleven trillion, five hundred fifty-one billion, five hundred sixteen million, five hundred forty-five thousand, five hundred five".