66633457 has 4 divisors (see below), whose sum is σ = 72691056. Its totient is φ = 60575860.

The previous prime is 66633449. The next prime is 66633491. The reversal of 66633457 is 75433666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66633457 - 2³ = 66633449 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66633407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3028783 + ... + 3028804.

It is an arithmetic number, because the mean of its divisors is an integer number (18172764).

Almost surely, 2^66633457 is an apocalyptic number.

It is an amenable number.

66633457 is a deficient number, since it is larger than the sum of its proper divisors (6057599).

66633457 is a wasteful number, since it uses less digits than its factorization.

66633457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057598.

The product of its digits is 272160, while the sum is 40.

The square root of 66633457 is about 8162.9318875022. The cubic root of 66633457 is about 405.4127925549.

The spelling of 66633457 in words is "sixty-six million, six hundred thirty-three thousand, four hundred fifty-seven".