66587861 has 8 divisors (see below), whose sum is σ = 72005760.
Its totient is φ = 61336768.
The previous prime is 66587839. The next prime is 66587863. The reversal of 66587861 is 16878566.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 66587861 - 26 = 66587797 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (47).
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (66587863) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40871 + ... + 42468.
It is an arithmetic number, because the mean of its divisors is an integer number (9000720).
Almost surely, 266587861 is an apocalyptic number.
It is an amenable number.
66587861 is a deficient number, since it is larger than the sum of its proper divisors (5417899).
66587861 is a wasteful number, since it uses less digits than its factorization.
66587861 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 83403.
The product of its digits is 483840, while the sum is 47.
The square root of 66587861 is about 8160.1385404906.
The cubic root of 66587861 is about 405.3202993817.
The spelling of 66587861 in words is "sixty-six million, five hundred eighty-seven thousand, eight hundred sixty-one".