11601115551 has 24 divisors (see below), whose sum is σ = 17730567920. Its totient is φ = 7289035776.

The previous prime is 11601115529. The next prime is 11601115573. The reversal of 11601115551 is 15551110611.

11601115551 is a `hidden beast` number, since 1 + 1 + 601 + 1 + 1 + 5 + 5 + 51 = 666.

It is an interprime number because it is at equal distance from previous prime (11601115529) and next prime (11601115573).

It is not a de Polignac number, because 11601115551 - 2¹³ = 11601107359 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 (11601115511) 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 23 ways as a sum of consecutive naturals, for example, 142756 + ... + 208761.

Almost surely, 2^11601115551 is an apocalyptic number.

11601115551 is a deficient number, since it is larger than the sum of its proper divisors (6129452369).

11601115551 is a wasteful number, since it uses less digits than its factorization.

11601115551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351735 (or 351732 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 27.

The spelling of 11601115551 in words is "eleven billion, six hundred one million, one hundred fifteen thousand, five hundred fifty-one".