42065661 has 16 divisors (see below), whose sum is σ = 62192448. Its totient is φ = 25075200.

The previous prime is 42065651. The next prime is 42065669. The reversal of 42065661 is 16656024.

It is not a de Polignac number, because 42065661 - 2⁵ = 42065629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42065669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8436 + ... + 12461.

It is an arithmetic number, because the mean of its divisors is an integer number (3887028).

Almost surely, 2^42065661 is an apocalyptic number.

It is an amenable number.

42065661 is a deficient number, since it is larger than the sum of its proper divisors (20126787).

42065661 is a wasteful number, since it uses less digits than its factorization.

42065661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20972.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 42065661 is about 6485.8045761494. The cubic root of 42065661 is about 347.7837125433.

The spelling of 42065661 in words is "forty-two million, sixty-five thousand, six hundred sixty-one".