66493999 has 8 divisors (see below), whose sum is σ = 78118992. Its totient is φ = 55799040.

The previous prime is 66493981. The next prime is 66494009. The reversal of 66493999 is 99939466.

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

It is not a de Polignac number, because 66493999 - 2⁹ = 66493487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66493969) 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, 232354 + ... + 232639.

It is an arithmetic number, because the mean of its divisors is an integer number (9764874).

Almost surely, 2^66493999 is an apocalyptic number.

66493999 is a deficient number, since it is larger than the sum of its proper divisors (11624993).

66493999 is a wasteful number, since it uses less digits than its factorization.

66493999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465017.

The product of its digits is 2834352, while the sum is 55.

The square root of 66493999 is about 8154.3852619312. The cubic root of 66493999 is about 405.1297638345.

It can be divided in two parts, 6649 and 3999, that added together give a cube (10648 = 22³).

The spelling of 66493999 in words is "sixty-six million, four hundred ninety-three thousand, nine hundred ninety-nine".