66170042 has 4 divisors (see below), whose sum is σ = 99255066. Its totient is φ = 33085020.

The previous prime is 66170029. The next prime is 66170053. The reversal of 66170042 is 24007166.

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., 66080641 + 89401 = 8129^2 + 299^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66169993 and 66170020.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16542509 + ... + 16542512.

Almost surely, 2^66170042 is an apocalyptic number.

66170042 is a deficient number, since it is larger than the sum of its proper divisors (33085024).

66170042 is a wasteful number, since it uses less digits than its factorization.

66170042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33085023.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66170042 is about 8134.4970342364. The cubic root of 66170042 is about 404.4707653095.

The spelling of 66170042 in words is "sixty-six million, one hundred seventy thousand, forty-two".