66127491 has 12 divisors (see below), whose sum is σ = 96091632. Its totient is φ = 43820016.

The previous prime is 66127489. The next prime is 66127499. The reversal of 66127491 is 19472166.

It is not a de Polignac number, because 66127491 - 2¹ = 66127489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66127499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20496 + ... + 23501.

It is an arithmetic number, because the mean of its divisors is an integer number (8007636).

Almost surely, 2^66127491 is an apocalyptic number.

66127491 is a deficient number, since it is larger than the sum of its proper divisors (29964141).

66127491 is a wasteful number, since it uses less digits than its factorization.

66127491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44170 (or 44167 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 66127491 is about 8131.8811476804. The cubic root of 66127491 is about 404.3840476879.

The spelling of 66127491 in words is "sixty-six million, one hundred twenty-seven thousand, four hundred ninety-one".