66532478 has 4 divisors (see below), whose sum is σ = 99798720. Its totient is φ = 33266238.

The previous prime is 66532447. The next prime is 66532511. The reversal of 66532478 is 87423566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16633118 + ... + 16633121.

It is an arithmetic number, because the mean of its divisors is an integer number (24949680).

Almost surely, 2^66532478 is an apocalyptic number.

66532478 is a deficient number, since it is larger than the sum of its proper divisors (33266242).

66532478 is a wasteful number, since it uses less digits than its factorization.

66532478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33266241.

The product of its digits is 241920, while the sum is 41.

The square root of 66532478 is about 8156.7443260164. The cubic root of 66532478 is about 405.2078961088.

The spelling of 66532478 in words is "sixty-six million, five hundred thirty-two thousand, four hundred seventy-eight".