66602491 has 8 divisors (see below), whose sum is σ = 68413968. Its totient is φ = 64800000.

The previous prime is 66602443. The next prime is 66602537. The reversal of 66602491 is 19420666.

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

It is a 8-Lehmer number, since φ(66602491) divides (66602491-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 66602491 - 2¹⁹ = 66078203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66602401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14416 + ... + 18466.

It is an arithmetic number, because the mean of its divisors is an integer number (8551746).

Almost surely, 2^66602491 is an apocalyptic number.

66602491 is a deficient number, since it is larger than the sum of its proper divisors (1811477).

66602491 is a wasteful number, since it uses less digits than its factorization.

66602491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 66602491 is about 8161.0349221162. The cubic root of 66602491 is about 405.3499814772.

The spelling of 66602491 in words is "sixty-six million, six hundred two thousand, four hundred ninety-one".