66424405 has 8 divisors (see below), whose sum is σ = 80832384. Its totient is φ = 52390800.

The previous prime is 66424381. The next prime is 66424411. The reversal of 66424405 is 50442466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66424405 - 2¹³ = 66416213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93201 + ... + 93910.

It is an arithmetic number, because the mean of its divisors is an integer number (10104048).

Almost surely, 2^66424405 is an apocalyptic number.

It is an amenable number.

66424405 is a deficient number, since it is larger than the sum of its proper divisors (14407979).

66424405 is a wasteful number, since it uses less digits than its factorization.

66424405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187187.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 66424405 is about 8150.1168703277. The cubic root of 66424405 is about 404.9883754221.

The spelling of 66424405 in words is "sixty-six million, four hundred twenty-four thousand, four hundred five".