66887261 has 8 divisors (see below), whose sum is σ = 76492224. Its totient is φ = 57294720.

The previous prime is 66887209. The next prime is 66887267. The reversal of 66887261 is 16278866.

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

It is a de Polignac number, because none of the positive numbers 2^k-66887261 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 (66887267) 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, 18221 + ... + 21581.

It is an arithmetic number, because the mean of its divisors is an integer number (9561528).

Almost surely, 2^66887261 is an apocalyptic number.

It is an amenable number.

66887261 is a deficient number, since it is larger than the sum of its proper divisors (9604963).

66887261 is a wasteful number, since it uses less digits than its factorization.

66887261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211.

The product of its digits is 193536, while the sum is 44.

The square root of 66887261 is about 8178.4632419544. The cubic root of 66887261 is about 405.9268737557.

The spelling of 66887261 in words is "sixty-six million, eight hundred eighty-seven thousand, two hundred sixty-one".