66257146 has 4 divisors (see below), whose sum is σ = 99385722. Its totient is φ = 33128572.

The previous prime is 66257117. The next prime is 66257179. The reversal of 66257146 is 64175266.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64175266 = 2 ⋅32087633.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 1535121 = 8045^2 + 1239^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16564285 + ... + 16564288.

Almost surely, 2^66257146 is an apocalyptic number.

66257146 is a deficient number, since it is larger than the sum of its proper divisors (33128576).

66257146 is a wasteful number, since it uses less digits than its factorization.

66257146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33128575.

The product of its digits is 60480, while the sum is 37.

The square root of 66257146 is about 8139.8492615036. The cubic root of 66257146 is about 404.6481646924.

The spelling of 66257146 in words is "sixty-six million, two hundred fifty-seven thousand, one hundred forty-six".