66717842 has 8 divisors (see below), whose sum is σ = 100129932. Its totient is φ = 33341200.

The previous prime is 66717829. The next prime is 66717851. The reversal of 66717842 is 24871766.

It can be written as a sum of positive squares in 2 ways, for example, as 64464841 + 2253001 = 8029^2 + 1501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66717842² = 8902540882273928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66717842.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3509 + ... + 12072.

Almost surely, 2^66717842 is an apocalyptic number.

66717842 is a deficient number, since it is larger than the sum of its proper divisors (33412090).

66717842 is a wasteful number, since it uses less digits than its factorization.

66717842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17724.

The product of its digits is 112896, while the sum is 41.

The square root of 66717842 is about 8168.0990444534. The cubic root of 66717842 is about 405.5838594064.

The spelling of 66717842 in words is "sixty-six million, seven hundred seventeen thousand, eight hundred forty-two".