11615257755 has 12 divisors (see below), whose sum is σ = 20133113520. Its totient is φ = 6194804112.

The previous prime is 11615257733. The next prime is 11615257781. The reversal of 11615257755 is 55775251611.

11615257755 is a `hidden beast` number, since 1 + 1 + 6 + 1 + 525 + 77 + 55 = 666.

It is not a de Polignac number, because 11615257755 - 2⁶ = 11615257691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 258116839 = 11615257755 / (1 + 1 + 6 + 1 + 5 + 2 + 5 + 7 + 7 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 11615257755.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129058375 + ... + 129058464.

It is an arithmetic number, because the mean of its divisors is an integer number (1677759460).

Almost surely, 2^11615257755 is an apocalyptic number.

11615257755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11615257755 is a deficient number, since it is larger than the sum of its proper divisors (8517855765).

11615257755 is a wasteful number, since it uses less digits than its factorization.

11615257755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258116850 (or 258116847 counting only the distinct ones).

The product of its digits is 367500, while the sum is 45.

The spelling of 11615257755 in words is "eleven billion, six hundred fifteen million, two hundred fifty-seven thousand, seven hundred fifty-five".