66712487 has 4 divisors (see below), whose sum is σ = 66841056. Its totient is φ = 66583920.

The previous prime is 66712423. The next prime is 66712493. The reversal of 66712487 is 78421766.

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 66712487 - 2⁶ = 66712423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66712417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63503 + ... + 64544.

It is an arithmetic number, because the mean of its divisors is an integer number (16710264).

Almost surely, 2^66712487 is an apocalyptic number.

66712487 is a deficient number, since it is larger than the sum of its proper divisors (128569).

66712487 is a wasteful number, since it uses less digits than its factorization.

66712487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128568.

The product of its digits is 112896, while the sum is 41.

The square root of 66712487 is about 8167.7712382265. The cubic root of 66712487 is about 405.5730079380.

The spelling of 66712487 in words is "sixty-six million, seven hundred twelve thousand, four hundred eighty-seven".