142665561 has 12 divisors (see below), whose sum is σ = 207999792. Its totient is φ = 94220856.

The previous prime is 142665541. The next prime is 142665571. The reversal of 142665561 is 165566241.

142665561 is a `hidden beast` number, since 1 + 42 + 66 + 556 + 1 = 666.

It is not a de Polignac number, because 142665561 - 2²² = 138471257 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (142665521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73111 + ... + 75036.

It is an arithmetic number, because the mean of its divisors is an integer number (17333316).

Almost surely, 2^142665561 is an apocalyptic number.

It is an amenable number.

142665561 is a deficient number, since it is larger than the sum of its proper divisors (65334231).

142665561 is a wasteful number, since it uses less digits than its factorization.

142665561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148260 (or 148257 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 142665561 is about 11944.2689604680. The cubic root of 142665561 is about 522.5241685058.

The spelling of 142665561 in words is "one hundred forty-two million, six hundred sixty-five thousand, five hundred sixty-one".