66798261 has 12 divisors (see below), whose sum is σ = 96665088. Its totient is φ = 44449704.

The previous prime is 66798229. The next prime is 66798299. The reversal of 66798261 is 16289766.

It is not a de Polignac number, because 66798261 - 2⁵ = 66798229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66798161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1525 + ... + 11658.

It is an arithmetic number, because the mean of its divisors is an integer number (8055424).

Almost surely, 2^66798261 is an apocalyptic number.

It is an amenable number.

66798261 is a deficient number, since it is larger than the sum of its proper divisors (29866827).

66798261 is a wasteful number, since it uses less digits than its factorization.

66798261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13752 (or 13749 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 66798261 is about 8173.0203107542. The cubic root of 66798261 is about 405.7467521262.

The spelling of 66798261 in words is "sixty-six million, seven hundred ninety-eight thousand, two hundred sixty-one".