66693121 has 8 divisors (see below), whose sum is σ = 75103488. Its totient is φ = 58674000.

The previous prime is 66693119. The next prime is 66693139. The reversal of 66693121 is 12139666.

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

It is not a de Polignac number, because 66693121 - 2¹ = 66693119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66693821) 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, 97450 + ... + 98131.

It is an arithmetic number, because the mean of its divisors is an integer number (9387936).

Almost surely, 2^66693121 is an apocalyptic number.

It is an amenable number.

66693121 is a deficient number, since it is larger than the sum of its proper divisors (8410367).

66693121 is a wasteful number, since it uses less digits than its factorization.

66693121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195623.

The product of its digits is 11664, while the sum is 34.

The square root of 66693121 is about 8166.5856390538. The cubic root of 66693121 is about 405.5337594786.

The spelling of 66693121 in words is "sixty-six million, six hundred ninety-three thousand, one hundred twenty-one".