2142243364565 has 4 divisors (see below), whose sum is σ = 2570692037484. Its totient is φ = 1713794691648.

The previous prime is 2142243364559. The next prime is 2142243364589. The reversal of 2142243364565 is 5654633422412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 858665396164 + 1283577968401 = 926642^2 + 1132951^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142243364565 - 2⁸ = 2142243364309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214224336452 + ... + 214224336461.

It is an arithmetic number, because the mean of its divisors is an integer number (642673009371).

Almost surely, 2^{2142243364565} is an apocalyptic number.

It is an amenable number.

2142243364565 is a deficient number, since it is larger than the sum of its proper divisors (428448672919).

2142243364565 is an equidigital number, since it uses as much as digits as its factorization.

2142243364565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428448672918.

The product of its digits is 4147200, while the sum is 47.

Adding to 2142243364565 its reverse (5654633422412), we get a palindrome (7796876786977).

The spelling of 2142243364565 in words is "two trillion, one hundred forty-two billion, two hundred forty-three million, three hundred sixty-four thousand, five hundred sixty-five".