142321232115661 has 2 divisors, whose sum is σ = 142321232115662. Its totient is φ = 142321232115660.

The previous prime is 142321232115509. The next prime is 142321232115691. The reversal of 142321232115661 is 166511232123241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118030972010436 + 24290260105225 = 10864206^2 + 4928515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142321232115661 is a prime.

It is a super-2 number, since 2×142321232115661² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142321232115691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71160616057830 + 71160616057831.

It is an arithmetic number, because the mean of its divisors is an integer number (71160616057831).

Almost surely, 2^{142321232115661} is an apocalyptic number.

It is an amenable number.

142321232115661 is a deficient number, since it is larger than the sum of its proper divisors (1).

142321232115661 is an equidigital number, since it uses as much as digits as its factorization.

142321232115661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The spelling of 142321232115661 in words is "one hundred forty-two trillion, three hundred twenty-one billion, two hundred thirty-two million, one hundred fifteen thousand, six hundred sixty-one".