66158474 has 4 divisors (see below), whose sum is σ = 99237714. Its totient is φ = 33079236.

The previous prime is 66158459. The next prime is 66158507. The reversal of 66158474 is 47485166.

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., 64915249 + 1243225 = 8057^2 + 1115^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16539617 + ... + 16539620.

Almost surely, 2^66158474 is an apocalyptic number.

66158474 is a deficient number, since it is larger than the sum of its proper divisors (33079240).

66158474 is a wasteful number, since it uses less digits than its factorization.

66158474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33079239.

The product of its digits is 161280, while the sum is 41.

The square root of 66158474 is about 8133.7859573510. The cubic root of 66158474 is about 404.4471937638.

The spelling of 66158474 in words is "sixty-six million, one hundred fifty-eight thousand, four hundred seventy-four".