66486261 has 16 divisors (see below), whose sum is σ = 92736000. Its totient is φ = 42290160.

The previous prime is 66486253. The next prime is 66486281. The reversal of 66486261 is 16268466.

It is not a de Polignac number, because 66486261 - 2³ = 66486253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66486281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33466 + ... + 35396.

It is an arithmetic number, because the mean of its divisors is an integer number (5796000).

Almost surely, 2^66486261 is an apocalyptic number.

It is an amenable number.

66486261 is a deficient number, since it is larger than the sum of its proper divisors (26249739).

66486261 is a wasteful number, since it uses less digits than its factorization.

66486261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456.

The product of its digits is 82944, while the sum is 39.

The square root of 66486261 is about 8153.9107794972. The cubic root of 66486261 is about 405.1140480517.

The spelling of 66486261 in words is "sixty-six million, four hundred eighty-six thousand, two hundred sixty-one".