66887471 has 8 divisors (see below), whose sum is σ = 77045760. Its totient is φ = 56879928.

The previous prime is 66887461. The next prime is 66887477. The reversal of 66887471 is 17478866.

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

It is not a de Polignac number, because 66887471 - 2¹⁴ = 66871087 is a prime.

It is a super-3 number, since 3×66887471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66887477) 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 7 ways as a sum of consecutive naturals, for example, 36731 + ... + 38508.

It is an arithmetic number, because the mean of its divisors is an integer number (9630720).

Almost surely, 2^66887471 is an apocalyptic number.

66887471 is a deficient number, since it is larger than the sum of its proper divisors (10158289).

66887471 is a wasteful number, since it uses less digits than its factorization.

66887471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75373.

The product of its digits is 451584, while the sum is 47.

The square root of 66887471 is about 8178.4760805421. The cubic root of 66887471 is about 405.9272985728.

The spelling of 66887471 in words is "sixty-six million, eight hundred eighty-seven thousand, four hundred seventy-one".