2115551266571 has 4 divisors (see below), whose sum is σ = 2115579822000. Its totient is φ = 2115522711144.

The previous prime is 2115551266559. The next prime is 2115551266643. The reversal of 2115551266571 is 1756621555112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115551266571 is a prime.

It is a super-2 number, since 2×2115551266571² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115551266511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14166296 + ... + 14314853.

It is an arithmetic number, because the mean of its divisors is an integer number (528894955500).

Almost surely, 2^{2115551266571} is an apocalyptic number.

2115551266571 is a deficient number, since it is larger than the sum of its proper divisors (28555429).

2115551266571 is an equidigital number, since it uses as much as digits as its factorization.

2115551266571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28555428.

The product of its digits is 630000, while the sum is 47.

The spelling of 2115551266571 in words is "two trillion, one hundred fifteen billion, five hundred fifty-one million, two hundred sixty-six thousand, five hundred seventy-one".