66813486 has 16 divisors (see below), whose sum is σ = 136735104. Its totient is φ = 21753144.

The previous prime is 66813479. The next prime is 66813491. The reversal of 66813486 is 68431866.

It is a happy number.

It is a super-2 number, since 2×66813486² = 8928083822944392, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 129226 + ... + 129741.

It is an arithmetic number, because the mean of its divisors is an integer number (8545944).

Almost surely, 2^66813486 is an apocalyptic number.

66813486 is an abundant number, since it is smaller than the sum of its proper divisors (69921618).

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

66813486 is a wasteful number, since it uses less digits than its factorization.

66813486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259015.

The product of its digits is 165888, while the sum is 42.

The square root of 66813486 is about 8173.9516759032. The cubic root of 66813486 is about 405.7775764068. Note that the first 3 decimals are identical.

The spelling of 66813486 in words is "sixty-six million, eight hundred thirteen thousand, four hundred eighty-six".