2155666665513 has 16 divisors (see below), whose sum is σ = 3000441951360. Its totient is φ = 1374053476224.

The previous prime is 2155666665419. The next prime is 2155666665527. The reversal of 2155666665513 is 3155666665512.

It is not a de Polignac number, because 2155666665513 - 2²¹ = 2155664568361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155666665553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6362578 + ... + 6692811.

It is an arithmetic number, because the mean of its divisors is an integer number (187527621960).

Almost surely, 2^{2155666665513} is an apocalyptic number.

2155666665513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2155666665513 is a deficient number, since it is larger than the sum of its proper divisors (844775285847).

2155666665513 is a wasteful number, since it uses less digits than its factorization.

2155666665513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13057808.

The product of its digits is 29160000, while the sum is 57.

Subtracting 2155666665513 from its reverse (3155666665512), we obtain a palindrome (999999999999).

The spelling of 2155666665513 in words is "two trillion, one hundred fifty-five billion, six hundred sixty-six million, six hundred sixty-five thousand, five hundred thirteen".