66491265 has 8 divisors (see below), whose sum is σ = 106386048. Its totient is φ = 35462000.

The previous prime is 66491261. The next prime is 66491303. The reversal of 66491265 is 56219466.

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

It is not a de Polignac number, because 66491265 - 2² = 66491261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66491261) 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, 2216361 + ... + 2216390.

It is an arithmetic number, because the mean of its divisors is an integer number (13298256).

Almost surely, 2^66491265 is an apocalyptic number.

It is an amenable number.

66491265 is a deficient number, since it is larger than the sum of its proper divisors (39894783).

66491265 is a wasteful number, since it uses less digits than its factorization.

66491265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4432759.

The product of its digits is 77760, while the sum is 39.

The square root of 66491265 is about 8154.2176203484. The cubic root of 66491265 is about 405.1242112534.

The spelling of 66491265 in words is "sixty-six million, four hundred ninety-one thousand, two hundred sixty-five".