66432261 has 16 divisors (see below), whose sum is σ = 101672064. Its totient is φ = 37795584.

The previous prime is 66432251. The next prime is 66432307. The reversal of 66432261 is 16223466.

It is not a de Polignac number, because 66432261 - 2⁵ = 66432229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66432221) 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, 1896 + ... + 11681.

It is an arithmetic number, because the mean of its divisors is an integer number (6354504).

Almost surely, 2^66432261 is an apocalyptic number.

It is an amenable number.

66432261 is a deficient number, since it is larger than the sum of its proper divisors (35239803).

66432261 is a wasteful number, since it uses less digits than its factorization.

66432261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13820.

The product of its digits is 10368, while the sum is 30.

The square root of 66432261 is about 8150.5988123573. The cubic root of 66432261 is about 405.0043407552.

The spelling of 66432261 in words is "sixty-six million, four hundred thirty-two thousand, two hundred sixty-one".