66798481 has 4 divisors (see below), whose sum is σ = 67389732. Its totient is φ = 66207232.

The previous prime is 66798469. The next prime is 66798493. The reversal of 66798481 is 18489766.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66798469) and next prime (66798493).

It can be written as a sum of positive squares in 2 ways, for example, as 5958481 + 60840000 = 2441^2 + 7800^2 .

It is a cyclic number.

It is not a de Polignac number, because 66798481 - 2⁵ = 66798449 is a prime.

It is a super-2 number, since 2×66798481² = 8924074127814722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66798401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295456 + ... + 295681.

It is an arithmetic number, because the mean of its divisors is an integer number (16847433).

Almost surely, 2^66798481 is an apocalyptic number.

It is an amenable number.

66798481 is a deficient number, since it is larger than the sum of its proper divisors (591251).

66798481 is a wasteful number, since it uses less digits than its factorization.

66798481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591250.

The product of its digits is 580608, while the sum is 49.

The square root of 66798481 is about 8173.0337696598. The cubic root of 66798481 is about 405.7471975679.

The spelling of 66798481 in words is "sixty-six million, seven hundred ninety-eight thousand, four hundred eighty-one".