220888915811 has 4 divisors (see below), whose sum is σ = 224632795800. Its totient is φ = 217145035824.

The previous prime is 220888915799. The next prime is 220888915813. The reversal of 220888915811 is 118519888022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118519888022 = 2 ⋅59259944011.

It is a de Polignac number, because none of the positive numbers 2^k-220888915811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220888915813) 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, 1871939906 + ... + 1871940023.

It is an arithmetic number, because the mean of its divisors is an integer number (56158198950).

Almost surely, 2^220888915811 is an apocalyptic number.

220888915811 is a deficient number, since it is larger than the sum of its proper divisors (3743879989).

220888915811 is an equidigital number, since it uses as much as digits as its factorization.

220888915811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743879988.

The product of its (nonzero) digits is 737280, while the sum is 53.

The spelling of 220888915811 in words is "two hundred twenty billion, eight hundred eighty-eight million, nine hundred fifteen thousand, eight hundred eleven".