142136636561 has 2 divisors, whose sum is σ = 142136636562. Its totient is φ = 142136636560.

The previous prime is 142136636527. The next prime is 142136636563. The reversal of 142136636561 is 165636631241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109101393025 + 33035243536 = 330305^2 + 181756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142136636561 is a prime.

Together with 142136636563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142136636563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71068318280 + 71068318281.

It is an arithmetic number, because the mean of its divisors is an integer number (71068318281).

Almost surely, 2^142136636561 is an apocalyptic number.

It is an amenable number.

142136636561 is a deficient number, since it is larger than the sum of its proper divisors (1).

142136636561 is an equidigital number, since it uses as much as digits as its factorization.

142136636561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The spelling of 142136636561 in words is "one hundred forty-two billion, one hundred thirty-six million, six hundred thirty-six thousand, five hundred sixty-one".