142323342251561 has 4 divisors (see below), whose sum is σ = 142565801097552. Its totient is φ = 142080883405572.

The previous prime is 142323342251551. The next prime is 142323342251639. The reversal of 142323342251561 is 165152243323241.

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 142323342251561 - 2³⁰ = 142322268509737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142323342251551) 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, 121229422115 + ... + 121229423288.

It is an arithmetic number, because the mean of its divisors is an integer number (35641450274388).

Almost surely, 2^{142323342251561} is an apocalyptic number.

It is an amenable number.

142323342251561 is a deficient number, since it is larger than the sum of its proper divisors (242458845991).

142323342251561 is an equidigital number, since it uses as much as digits as its factorization.

142323342251561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242458845990.

The product of its digits is 1036800, while the sum is 44.

The spelling of 142323342251561 in words is "one hundred forty-two trillion, three hundred twenty-three billion, three hundred forty-two million, two hundred fifty-one thousand, five hundred sixty-one".