66365121 has 8 divisors (see below), whose sum is σ = 88541824. Its totient is φ = 44215920.

The previous prime is 66365113. The next prime is 66365149. The reversal of 66365121 is 12156366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66365121 - 2³ = 66365113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66365521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361 + ... + 11526.

It is an arithmetic number, because the mean of its divisors is an integer number (11067728).

Almost surely, 2^66365121 is an apocalyptic number.

It is an amenable number.

66365121 is a deficient number, since it is larger than the sum of its proper divisors (22176703).

66365121 is a wasteful number, since it uses less digits than its factorization.

66365121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13751.

The product of its digits is 6480, while the sum is 30.

The square root of 66365121 is about 8146.4790553956. The cubic root of 66365121 is about 404.8678550742.

The spelling of 66365121 in words is "sixty-six million, three hundred sixty-five thousand, one hundred twenty-one".