66450419 has 16 divisors (see below), whose sum is σ = 78067200. Its totient is φ = 56536200.

The previous prime is 66450413. The next prime is 66450421. The reversal of 66450419 is 91405466.

It is not a de Polignac number, because 66450419 - 2¹² = 66446323 is a prime.

It is a super-2 number, since 2×66450419² = 8831316370551122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450413) 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, 51152 + ... + 52434.

It is an arithmetic number, because the mean of its divisors is an integer number (4879200).

Almost surely, 2^66450419 is an apocalyptic number.

66450419 is a deficient number, since it is larger than the sum of its proper divisors (11616781).

66450419 is a wasteful number, since it uses less digits than its factorization.

66450419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 66450419 is about 8151.7126421385. The cubic root of 66450419 is about 405.0412374817.

The spelling of 66450419 in words is "sixty-six million, four hundred fifty thousand, four hundred nineteen".