66305121 has 4 divisors (see below), whose sum is σ = 88406832. Its totient is φ = 44203412.

The previous prime is 66305101. The next prime is 66305137. The reversal of 66305121 is 12150366.

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 66305121 - 2⁷ = 66304993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66305091 and 66305100.

It is not an unprimeable number, because it can be changed into a prime (66305101) 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, 11050851 + ... + 11050856.

It is an arithmetic number, because the mean of its divisors is an integer number (22101708).

Almost surely, 2^66305121 is an apocalyptic number.

It is an amenable number.

66305121 is a deficient number, since it is larger than the sum of its proper divisors (22101711).

66305121 is a wasteful number, since it uses less digits than its factorization.

66305121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22101710.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66305121 is about 8142.7956501438. The cubic root of 66305121 is about 404.7458060453.

Adding to 66305121 its reverse (12150366), we get a palindrome (78455487).

The spelling of 66305121 in words is "sixty-six million, three hundred five thousand, one hundred twenty-one".