42607666 has 4 divisors (see below), whose sum is σ = 63911502. Its totient is φ = 21303832.

The previous prime is 42607639. The next prime is 42607687. The reversal of 42607666 is 66670624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42575625 + 32041 = 6525^2 + 179^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651915 + ... + 10651918.

Almost surely, 2^42607666 is an apocalyptic number.

42607666 is a deficient number, since it is larger than the sum of its proper divisors (21303836).

42607666 is a wasteful number, since it uses less digits than its factorization.

42607666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21303835.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 42607666 is about 6527.4547872812. The cubic root of 42607666 is about 349.2710433761.

The spelling of 42607666 in words is "forty-two million, six hundred seven thousand, six hundred sixty-six".