66487091 has 8 divisors (see below), whose sum is σ = 72638400. Its totient is φ = 60353640.

The previous prime is 66487087. The next prime is 66487103. The reversal of 66487091 is 19078466.

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 66487091 - 2² = 66487087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66487021) 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, 4040 + ... + 12218.

It is an arithmetic number, because the mean of its divisors is an integer number (9079800).

Almost surely, 2^66487091 is an apocalyptic number.

66487091 is a deficient number, since it is larger than the sum of its proper divisors (6151309).

66487091 is a wasteful number, since it uses less digits than its factorization.

66487091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8929.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 66487091 is about 8153.9616751613. The cubic root of 66487091 is about 405.1157338299.

The spelling of 66487091 in words is "sixty-six million, four hundred eighty-seven thousand, ninety-one".