142020665 has 8 divisors (see below), whose sum is σ = 170518920. Its totient is φ = 113553792.

The previous prime is 142020647. The next prime is 142020667. The reversal of 142020665 is 566020241.

It can be written as a sum of positive squares in 4 ways, for example, as 12243001 + 129777664 = 3499^2 + 11392^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142020665 - 2⁸ = 142020409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142020667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3647 + ... + 17243.

It is an arithmetic number, because the mean of its divisors is an integer number (21314865).

Almost surely, 2^142020665 is an apocalyptic number.

It is an amenable number.

142020665 is a deficient number, since it is larger than the sum of its proper divisors (28498255).

142020665 is a wasteful number, since it uses less digits than its factorization.

142020665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15691.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 142020665 is about 11917.2423404074. The cubic root of 142020665 is about 521.7356512505.

The spelling of 142020665 in words is "one hundred forty-two million, twenty thousand, six hundred sixty-five".