42551066 has 4 divisors (see below), whose sum is σ = 63826602. Its totient is φ = 21275532.

The previous prime is 42551057. The next prime is 42551107. The reversal of 42551066 is 66015524.

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., 33120025 + 9431041 = 5755^2 + 3071^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637765 + ... + 10637768.

Almost surely, 2^42551066 is an apocalyptic number.

42551066 is a deficient number, since it is larger than the sum of its proper divisors (21275536).

42551066 is a wasteful number, since it uses less digits than its factorization.

42551066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21275535.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 42551066 is about 6523.1178128254. The cubic root of 42551066 is about 349.1163176896.

The spelling of 42551066 in words is "forty-two million, five hundred fifty-one thousand, sixty-six".