66813414 has 36 divisors (see below), whose sum is σ = 138480492. Its totient is φ = 21490280.

The previous prime is 66813389. The next prime is 66813427. The reversal of 66813414 is 41431866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 940999 + ... + 941069.

Almost surely, 2^66813414 is an apocalyptic number.

66813414 is an abundant number, since it is smaller than the sum of its proper divisors (71667078).

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

66813414 is an equidigital number, since it uses as much as digits as its factorization.

66813414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 123 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 66813414 is about 8173.9472716675. The cubic root of 66813414 is about 405.7774306479. Note that the first 3 decimals are identical.

Multiplying 66813414 by its product of digits (13824), we get a square (923628635136 = 961056²).

The spelling of 66813414 in words is "sixty-six million, eight hundred thirteen thousand, four hundred fourteen".