66675415 has 4 divisors (see below), whose sum is σ = 80010504. Its totient is φ = 53340328.

The previous prime is 66675383. The next prime is 66675421. The reversal of 66675415 is 51457666.

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

It is a cyclic number.

It is not a de Polignac number, because 66675415 - 2⁵ = 66675383 is a prime.

It is a super-2 number, since 2×66675415² = 8891221930844450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6667537 + ... + 6667546.

It is an arithmetic number, because the mean of its divisors is an integer number (20002626).

Almost surely, 2^66675415 is an apocalyptic number.

66675415 is a deficient number, since it is larger than the sum of its proper divisors (13335089).

66675415 is a wasteful number, since it uses less digits than its factorization.

66675415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13335088.

The product of its digits is 151200, while the sum is 40.

The square root of 66675415 is about 8165.5015155225. The cubic root of 66675415 is about 405.4978686393.

The spelling of 66675415 in words is "sixty-six million, six hundred seventy-five thousand, four hundred fifteen".