66149549 has 4 divisors (see below), whose sum is σ = 66202080. Its totient is φ = 66097020.

The previous prime is 66149543. The next prime is 66149557. The reversal of 66149549 is 94594166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66149549 - 2²⁴ = 49372333 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 (66149543) 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, 24329 + ... + 26910.

It is an arithmetic number, because the mean of its divisors is an integer number (16550520).

Almost surely, 2^66149549 is an apocalyptic number.

It is an amenable number.

66149549 is a deficient number, since it is larger than the sum of its proper divisors (52531).

66149549 is a wasteful number, since it uses less digits than its factorization.

66149549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52530.

The product of its digits is 233280, while the sum is 44.

The square root of 66149549 is about 8133.2373013456. The cubic root of 66149549 is about 404.4290058517.

The spelling of 66149549 in words is "sixty-six million, one hundred forty-nine thousand, five hundred forty-nine".