142665571 has 2 divisors, whose sum is σ = 142665572. Its totient is φ = 142665570.

The previous prime is 142665541. The next prime is 142665617. The reversal of 142665571 is 175566241.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142665571 - 2⁹ = 142665059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142665571.

It is not a weakly prime, because it can be changed into another prime (142665521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71332785 + 71332786.

It is an arithmetic number, because the mean of its divisors is an integer number (71332786).

Almost surely, 2^142665571 is an apocalyptic number.

142665571 is a deficient number, since it is larger than the sum of its proper divisors (1).

142665571 is an equidigital number, since it uses as much as digits as its factorization.

142665571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 142665571 is about 11944.2693790788. The cubic root of 142665571 is about 522.5241807144.

The spelling of 142665571 in words is "one hundred forty-two million, six hundred sixty-five thousand, five hundred seventy-one".