66821862 has 8 divisors (see below), whose sum is σ = 133643736. Its totient is φ = 22273952.

The previous prime is 66821857. The next prime is 66821891. The reversal of 66821862 is 26812866.

It is a sphenic number, since it is the product of 3 distinct primes.

66821862 is an admirable number.

It is a super-2 number, since 2×66821862² = 8930322482294088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66821862.

It is a congruent number.

It is an unprimeable number.

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, 5568483 + ... + 5568494.

It is an arithmetic number, because the mean of its divisors is an integer number (16705467).

Almost surely, 2^66821862 is an apocalyptic number.

66821862 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66821862 is a wasteful number, since it uses less digits than its factorization.

66821862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11136982.

The product of its digits is 55296, while the sum is 39.

The square root of 66821862 is about 8174.4640191269. The cubic root of 66821862 is about 405.7945323198.

The spelling of 66821862 in words is "sixty-six million, eight hundred twenty-one thousand, eight hundred sixty-two".