66448491 has 16 divisors (see below), whose sum is σ = 93450240. Its totient is φ = 41882400.

The previous prime is 66448463. The next prime is 66448511. The reversal of 66448491 is 19484466.

It is not a de Polignac number, because 66448491 - 2¹³ = 66440299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66448441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39126 + ... + 40788.

It is an arithmetic number, because the mean of its divisors is an integer number (5840640).

Almost surely, 2^66448491 is an apocalyptic number.

66448491 is a deficient number, since it is larger than the sum of its proper divisors (27001749).

66448491 is a wasteful number, since it uses less digits than its factorization.

66448491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386.

The product of its digits is 165888, while the sum is 42.

The square root of 66448491 is about 8151.5943839227. The cubic root of 66448491 is about 405.0373201396.

The spelling of 66448491 in words is "sixty-six million, four hundred forty-eight thousand, four hundred ninety-one".