66465415 has 4 divisors (see below), whose sum is σ = 79758504. Its totient is φ = 53172328.

The previous prime is 66465397. The next prime is 66465433. The reversal of 66465415 is 51456466.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66465397) and next prime (66465433).

It is a cyclic number.

It is not a de Polignac number, because 66465415 - 2⁹ = 66464903 is a prime.

It is a super-2 number, since 2×66465415² = 8835302782244450, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 6646537 + ... + 6646546.

It is an arithmetic number, because the mean of its divisors is an integer number (19939626).

Almost surely, 2^66465415 is an apocalyptic number.

66465415 is a deficient number, since it is larger than the sum of its proper divisors (13293089).

66465415 is a wasteful number, since it uses less digits than its factorization.

66465415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13293088.

The product of its digits is 86400, while the sum is 37.

The square root of 66465415 is about 8152.6323969623. The cubic root of 66465415 is about 405.0717040141.

The spelling of 66465415 in words is "sixty-six million, four hundred sixty-five thousand, four hundred fifteen".