11655578354861 has 12 divisors (see below), whose sum is σ = 13472013078432. Its totient is φ = 9878242924704.

The previous prime is 11655578354851. The next prime is 11655578354867. The reversal of 11655578354861 is 16845387555611.

11655578354861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-11655578354861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11655578354867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105050135 + ... + 105161028.

It is an arithmetic number, because the mean of its divisors is an integer number (1122667756536).

Almost surely, 2^{11655578354861} is an apocalyptic number.

It is an amenable number.

11655578354861 is a deficient number, since it is larger than the sum of its proper divisors (1816434723571).

11655578354861 is an frugal number, since it uses more digits than its factorization.

11655578354861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210211348 (or 210211259 counting only the distinct ones).

The product of its digits is 120960000, while the sum is 65.

The spelling of 11655578354861 in words is "eleven trillion, six hundred fifty-five billion, five hundred seventy-eight million, three hundred fifty-four thousand, eight hundred sixty-one".