66499231 has 4 divisors (see below), whose sum is σ = 66616264. Its totient is φ = 66382200.

The previous prime is 66499207. The next prime is 66499241. The reversal of 66499231 is 13299466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13299466 = 2 ⋅6649733.

It is a cyclic number.

It is not a de Polignac number, because 66499231 - 2¹³ = 66491039 is a prime.

It is a super-2 number, since 2×66499231² = 8844295447182722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66499241) 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, 57660 + ... + 58801.

It is an arithmetic number, because the mean of its divisors is an integer number (16654066).

Almost surely, 2^66499231 is an apocalyptic number.

66499231 is a deficient number, since it is larger than the sum of its proper divisors (117033).

66499231 is a wasteful number, since it uses less digits than its factorization.

66499231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117032.

The product of its digits is 69984, while the sum is 40.

The square root of 66499231 is about 8154.7060645985. The cubic root of 66499231 is about 405.1403892712.

The spelling of 66499231 in words is "sixty-six million, four hundred ninety-nine thousand, two hundred thirty-one".