2245142321781 has 4 divisors (see below), whose sum is σ = 2993523095712. Its totient is φ = 1496761547852.

The previous prime is 2245142321777. The next prime is 2245142321791. The reversal of 2245142321781 is 1871232415422.

2245142321781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2245142321781 - 2² = 2245142321777 is a prime.

It is a super-3 number, since 3×2245142321781³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2245142321731) 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, 374190386961 + ... + 374190386966.

It is an arithmetic number, because the mean of its divisors is an integer number (748380773928).

Almost surely, 2^{2245142321781} is an apocalyptic number.

It is an amenable number.

2245142321781 is a deficient number, since it is larger than the sum of its proper divisors (748380773931).

2245142321781 is an equidigital number, since it uses as much as digits as its factorization.

2245142321781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748380773930.

The product of its digits is 215040, while the sum is 42.

The spelling of 2245142321781 in words is "two trillion, two hundred forty-five billion, one hundred forty-two million, three hundred twenty-one thousand, seven hundred eighty-one".