66813459 has 8 divisors (see below), whose sum is σ = 92957952. Its totient is φ = 42605640.

The previous prime is 66813437. The next prime is 66813479. The reversal of 66813459 is 95431866.

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

It is not a de Polignac number, because 66813459 - 2⁵ = 66813427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66813459.

It is not an unprimeable number, because it can be changed into a prime (66813479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484087 + ... + 484224.

It is an arithmetic number, because the mean of its divisors is an integer number (11619744).

Almost surely, 2^66813459 is an apocalyptic number.

66813459 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

66813459 is a deficient number, since it is larger than the sum of its proper divisors (26144493).

66813459 is a wasteful number, since it uses less digits than its factorization.

66813459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968337.

The product of its digits is 155520, while the sum is 42.

The square root of 66813459 is about 8173.9500243150. The cubic root of 66813459 is about 405.7775217472. Note that the first 3 decimals are identical.

The spelling of 66813459 in words is "sixty-six million, eight hundred thirteen thousand, four hundred fifty-nine".