2265778121 has 8 divisors (see below), whose sum is σ = 2360383200. Its totient is φ = 2173046560.

The previous prime is 2265778111. The next prime is 2265778133. The reversal of 2265778121 is 1218775622.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2265778121 - 2¹⁰ = 2265777097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2265778111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465911 + ... + 470748.

It is an arithmetic number, because the mean of its divisors is an integer number (295047900).

Almost surely, 2^2265778121 is an apocalyptic number.

It is an amenable number.

2265778121 is a deficient number, since it is larger than the sum of its proper divisors (94605079).

2265778121 is an equidigital number, since it uses as much as digits as its factorization.

2265778121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936759.

The product of its digits is 94080, while the sum is 41.

The square root of 2265778121 is about 47600.1903462581. The cubic root of 2265778121 is about 1313.4265558568.

The spelling of 2265778121 in words is "two billion, two hundred sixty-five million, seven hundred seventy-eight thousand, one hundred twenty-one".