66444415 has 24 divisors (see below), whose sum is σ = 86918832. Its totient is φ = 48591360.

The previous prime is 66444409. The next prime is 66444421. The reversal of 66444415 is 51444466.

It is an interprime number because it is at equal distance from previous prime (66444409) and next prime (66444421).

It is not a de Polignac number, because 66444415 - 2³ = 66444407 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 23 ways as a sum of consecutive naturals, for example, 116080 + ... + 116650.

It is an arithmetic number, because the mean of its divisors is an integer number (3621618).

Almost surely, 2^66444415 is an apocalyptic number.

66444415 is a deficient number, since it is larger than the sum of its proper divisors (20474417).

66444415 is a wasteful number, since it uses less digits than its factorization.

66444415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 630 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 66444415 is about 8151.3443676488. The cubic root of 66444415 is about 405.0290382065.

The spelling of 66444415 in words is "sixty-six million, four hundred forty-four thousand, four hundred fifteen".