66774142 has 4 divisors (see below), whose sum is σ = 100161216. Its totient is φ = 33387070.

The previous prime is 66774109. The next prime is 66774157. The reversal of 66774142 is 24147766.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16693534 + ... + 16693537.

It is an arithmetic number, because the mean of its divisors is an integer number (25040304).

Almost surely, 2^66774142 is an apocalyptic number.

66774142 is a deficient number, since it is larger than the sum of its proper divisors (33387074).

66774142 is a wasteful number, since it uses less digits than its factorization.

66774142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33387073.

The product of its digits is 56448, while the sum is 37.

The square root of 66774142 is about 8171.5446520227. The cubic root of 66774142 is about 405.6979116133.

The spelling of 66774142 in words is "sixty-six million, seven hundred seventy-four thousand, one hundred forty-two".