66478249 has 4 divisors (see below), whose sum is σ = 66507664. Its totient is φ = 66448836.

The previous prime is 66478213. The next prime is 66478259. The reversal of 66478249 is 94287466.

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.

It is a cyclic number.

It is not a de Polignac number, because 66478249 - 2¹³ = 66470057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66478199 and 66478208.

It is not an unprimeable number, because it can be changed into a prime (66478259) 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, 11007 + ... + 15940.

It is an arithmetic number, because the mean of its divisors is an integer number (16626916).

Almost surely, 2^66478249 is an apocalyptic number.

It is an amenable number.

66478249 is a deficient number, since it is larger than the sum of its proper divisors (29415).

66478249 is a wasteful number, since it uses less digits than its factorization.

66478249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29414.

The product of its digits is 580608, while the sum is 46.

The square root of 66478249 is about 8153.4194667023. The cubic root of 66478249 is about 405.0977744934.

The spelling of 66478249 in words is "sixty-six million, four hundred seventy-eight thousand, two hundred forty-nine".