66534139 has 4 divisors (see below), whose sum is σ = 76039024. Its totient is φ = 57029256.

The previous prime is 66534137. The next prime is 66534151. The reversal of 66534139 is 93143566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66534139 - 2¹ = 66534137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66534098 and 66534107.

It is not an unprimeable number, because it can be changed into a prime (66534131) 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, 4752432 + ... + 4752445.

It is an arithmetic number, because the mean of its divisors is an integer number (19009756).

Almost surely, 2^66534139 is an apocalyptic number.

66534139 is a deficient number, since it is larger than the sum of its proper divisors (9504885).

66534139 is an equidigital number, since it uses as much as digits as its factorization.

66534139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504884.

The product of its digits is 58320, while the sum is 37.

The square root of 66534139 is about 8156.8461429648. The cubic root of 66534139 is about 405.2112681197.

The spelling of 66534139 in words is "sixty-six million, five hundred thirty-four thousand, one hundred thirty-nine".