66687605 has 8 divisors (see below), whose sum is σ = 80405664. Its totient is φ = 53096400.

The previous prime is 66687581. The next prime is 66687619. The reversal of 66687605 is 50678666.

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

It is not a de Polignac number, because 66687605 - 2⁸ = 66687349 is a prime.

It is a Duffinian number.

It is a Curzon 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, 30551 + ... + 32660.

It is an arithmetic number, because the mean of its divisors is an integer number (10050708).

Almost surely, 2^66687605 is an apocalyptic number.

It is an amenable number.

66687605 is a deficient number, since it is larger than the sum of its proper divisors (13718059).

66687605 is a wasteful number, since it uses less digits than its factorization.

66687605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63427.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 66687605 is about 8166.2479144341. The cubic root of 66687605 is about 405.5225789857.

The spelling of 66687605 in words is "sixty-six million, six hundred eighty-seven thousand, six hundred five".