220378091881 has 4 divisors (see below), whose sum is σ = 220379116500. Its totient is φ = 220377067264.

The previous prime is 220378091833. The next prime is 220378091903. The reversal of 220378091881 is 188190873022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 42033200400 + 178344891481 = 205020^2 + 422309^2 .

It is a cyclic number.

It is not a de Polignac number, because 220378091881 - 2⁷ = 220378091753 is a prime.

It is a super-3 number, since 3×220378091881³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220378091831) 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, 51556 + ... + 665893.

It is an arithmetic number, because the mean of its divisors is an integer number (55094779125).

Almost surely, 2^220378091881 is an apocalyptic number.

It is an amenable number.

220378091881 is a deficient number, since it is larger than the sum of its proper divisors (1024619).

220378091881 is an equidigital number, since it uses as much as digits as its factorization.

220378091881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024618.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 220378091881 in words is "two hundred twenty billion, three hundred seventy-eight million, ninety-one thousand, eight hundred eighty-one".