66654457 has 4 divisors (see below), whose sum is σ = 66908160. Its totient is φ = 66400756.

The previous prime is 66654421. The next prime is 66654487. The reversal of 66654457 is 75445666.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75445666 = 2 ⋅37722833.

It is a cyclic number.

It is not a de Polignac number, because 66654457 - 2²³ = 58265849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66654407) 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, 126457 + ... + 126982.

It is an arithmetic number, because the mean of its divisors is an integer number (16727040).

Almost surely, 2^66654457 is an apocalyptic number.

It is an amenable number.

66654457 is a deficient number, since it is larger than the sum of its proper divisors (253703).

66654457 is a wasteful number, since it uses less digits than its factorization.

66654457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253702.

The product of its digits is 604800, while the sum is 43.

The square root of 66654457 is about 8164.2180887088. The cubic root of 66654457 is about 405.4553776406.

The spelling of 66654457 in words is "sixty-six million, six hundred fifty-four thousand, four hundred fifty-seven".