66016415 has 4 divisors (see below), whose sum is σ = 79219704. Its totient is φ = 52813128.

The previous prime is 66016369. The next prime is 66016427. The reversal of 66016415 is 51461066.

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 66016415 - 2²⁰ = 64967839 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 3 ways as a sum of consecutive naturals, for example, 6601637 + ... + 6601646.

It is an arithmetic number, because the mean of its divisors is an integer number (19804926).

Almost surely, 2^66016415 is an apocalyptic number.

66016415 is a deficient number, since it is larger than the sum of its proper divisors (13203289).

66016415 is a wasteful number, since it uses less digits than its factorization.

66016415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13203288.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66016415 is about 8125.0486152392. The cubic root of 66016415 is about 404.1575027976.

The spelling of 66016415 in words is "sixty-six million, sixteen thousand, four hundred fifteen".