66775499 has 4 divisors (see below), whose sum is σ = 76314864. Its totient is φ = 57236136.

The previous prime is 66775477. The next prime is 66775523. The reversal of 66775499 is 99457766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99457766 = 2 ⋅49728883.

It is a cyclic number.

It is not a de Polignac number, because 66775499 - 2²⁴ = 49998283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66775499.

It is not an unprimeable number, because it can be changed into a prime (66775199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4769672 + ... + 4769685.

It is an arithmetic number, because the mean of its divisors is an integer number (19078716).

Almost surely, 2^66775499 is an apocalyptic number.

66775499 is a deficient number, since it is larger than the sum of its proper divisors (9539365).

66775499 is an equidigital number, since it uses as much as digits as its factorization.

66775499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9539364.

The product of its digits is 2857680, while the sum is 53.

The square root of 66775499 is about 8171.6276836381. The cubic root of 66775499 is about 405.7006598245.

The spelling of 66775499 in words is "sixty-six million, seven hundred seventy-five thousand, four hundred ninety-nine".