66534149 has 24 divisors (see below), whose sum is σ = 77054880. Its totient is φ = 57324960.

The previous prime is 66534137. The next prime is 66534151. The reversal of 66534149 is 94143566.

It is not a de Polignac number, because 66534149 - 2⁸ = 66533893 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 (66534119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234962 + ... + 235244.

It is an arithmetic number, because the mean of its divisors is an integer number (3210620).

Almost surely, 2^66534149 is an apocalyptic number.

It is an amenable number.

66534149 is a deficient number, since it is larger than the sum of its proper divisors (10520731).

66534149 is a wasteful number, since it uses less digits than its factorization.

66534149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 390 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 66534149 is about 8156.8467559468. The cubic root of 66534149 is about 405.2112884206.

The spelling of 66534149 in words is "sixty-six million, five hundred thirty-four thousand, one hundred forty-nine".