66534121 has 4 divisors (see below), whose sum is σ = 66906000. Its totient is φ = 66162244.

The previous prime is 66534119. The next prime is 66534131. The reversal of 66534121 is 12143566.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12143566 = 2 ⋅6071783.

It is a cyclic number.

It is not a de Polignac number, because 66534121 - 2¹ = 66534119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66534121.

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, 185671 + ... + 186028.

It is an arithmetic number, because the mean of its divisors is an integer number (16726500).

Almost surely, 2^66534121 is an apocalyptic number.

It is an amenable number.

66534121 is a deficient number, since it is larger than the sum of its proper divisors (371879).

66534121 is a wasteful number, since it uses less digits than its factorization.

66534121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371878.

The product of its digits is 4320, while the sum is 28.

The square root of 66534121 is about 8156.8450395971. The cubic root of 66534121 is about 405.2112315780.

Adding to 66534121 its reverse (12143566), we get a palindrome (78677687).

The spelling of 66534121 in words is "sixty-six million, five hundred thirty-four thousand, one hundred twenty-one".