66346491 has 16 divisors (see below), whose sum is σ = 89999360. Its totient is φ = 43467840.

The previous prime is 66346457. The next prime is 66346493. The reversal of 66346491 is 19464366.

It is not a de Polignac number, because 66346491 - 2¹⁷ = 66215419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66346493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63711 + ... + 64743.

It is an arithmetic number, because the mean of its divisors is an integer number (5624960).

Almost surely, 2^66346491 is an apocalyptic number.

66346491 is a deficient number, since it is larger than the sum of its proper divisors (23652869).

66346491 is a wasteful number, since it uses less digits than its factorization.

66346491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its digits is 93312, while the sum is 39.

The square root of 66346491 is about 8145.3355363668. The cubic root of 66346491 is about 404.8299667280.

The spelling of 66346491 in words is "sixty-six million, three hundred forty-six thousand, four hundred ninety-one".