66821483 has 4 divisors (see below), whose sum is σ = 67070160. Its totient is φ = 66572808.

The previous prime is 66821479. The next prime is 66821551. The reversal of 66821483 is 38412866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38412866 = 2 ⋅19206433.

It is a cyclic number.

It is not a de Polignac number, because 66821483 - 2² = 66821479 is a prime.

It is a super-2 number, since 2×66821483² = 8930221180638578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66821473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123935 + ... + 124472.

It is an arithmetic number, because the mean of its divisors is an integer number (16767540).

Almost surely, 2^66821483 is an apocalyptic number.

66821483 is a deficient number, since it is larger than the sum of its proper divisors (248677).

66821483 is a wasteful number, since it uses less digits than its factorization.

66821483 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248676.

The product of its digits is 55296, while the sum is 38.

The square root of 66821483 is about 8174.4408371460. The cubic root of 66821483 is about 405.7937651237.

The spelling of 66821483 in words is "sixty-six million, eight hundred twenty-one thousand, four hundred eighty-three".