66142418 has 4 divisors (see below), whose sum is σ = 99213630. Its totient is φ = 33071208.

The previous prime is 66142343. The next prime is 66142423. The reversal of 66142418 is 81424166.

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., 52027369 + 14115049 = 7213^2 + 3757^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16535603 + ... + 16535606.

Almost surely, 2^66142418 is an apocalyptic number.

66142418 is a deficient number, since it is larger than the sum of its proper divisors (33071212).

66142418 is a wasteful number, since it uses less digits than its factorization.

66142418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33071211.

The product of its digits is 9216, while the sum is 32.

The square root of 66142418 is about 8132.7989032067. The cubic root of 66142418 is about 404.4144726869.

The spelling of 66142418 in words is "sixty-six million, one hundred forty-two thousand, four hundred eighteen".