66715487 has 8 divisors (see below), whose sum is σ = 68457312. Its totient is φ = 64979200.

The previous prime is 66715471. The next prime is 66715501. The reversal of 66715487 is 78451766.

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 66715487 - 2⁴ = 66715471 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 (66715417) 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, 35198 + ... + 37044.

It is an arithmetic number, because the mean of its divisors is an integer number (8557164).

Almost surely, 2^66715487 is an apocalyptic number.

66715487 is a deficient number, since it is larger than the sum of its proper divisors (1741825).

66715487 is a wasteful number, since it uses less digits than its factorization.

66715487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769.

The product of its digits is 282240, while the sum is 44.

The square root of 66715487 is about 8167.9548847922. The cubic root of 66715487 is about 405.5790872635.

The spelling of 66715487 in words is "sixty-six million, seven hundred fifteen thousand, four hundred eighty-seven".