66099121 has 4 divisors (see below), whose sum is σ = 72108144. Its totient is φ = 60090100.

The previous prime is 66099097. The next prime is 66099133. The reversal of 66099121 is 12199066.

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 66099121 - 2¹³ = 66090929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66099521) 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, 3004495 + ... + 3004516.

It is an arithmetic number, because the mean of its divisors is an integer number (18027036).

Almost surely, 2^66099121 is an apocalyptic number.

It is an amenable number.

66099121 is a deficient number, since it is larger than the sum of its proper divisors (6009023).

66099121 is a wasteful number, since it uses less digits than its factorization.

66099121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6009022.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 66099121 is about 8130.1365917185. The cubic root of 66099121 is about 404.3262098342.

The spelling of 66099121 in words is "sixty-six million, ninety-nine thousand, one hundred twenty-one".