142521043155581 has 2 divisors, whose sum is σ = 142521043155582. Its totient is φ = 142521043155580.

The previous prime is 142521043155577. The next prime is 142521043155613. The reversal of 142521043155581 is 185551340125241.

142521043155581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105479760471556 + 37041282684025 = 10270334^2 + 6086155^2 .

It is an emirp because it is prime and its reverse (185551340125241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142521043155581 - 2² = 142521043155577 is a prime.

It is a super-2 number, since 2×142521043155581² (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 (142521043158581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71260521577790 + 71260521577791.

It is an arithmetic number, because the mean of its divisors is an integer number (71260521577791).

Almost surely, 2^{142521043155581} is an apocalyptic number.

It is an amenable number.

142521043155581 is a deficient number, since it is larger than the sum of its proper divisors (1).

142521043155581 is an equidigital number, since it uses as much as digits as its factorization.

142521043155581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960000, while the sum is 47.

The spelling of 142521043155581 in words is "one hundred forty-two trillion, five hundred twenty-one billion, forty-three million, one hundred fifty-five thousand, five hundred eighty-one".