66715121 has 8 divisors (see below), whose sum is σ = 72853824. Its totient is φ = 60588720.

The previous prime is 66715097. The next prime is 66715127. The reversal of 66715121 is 12151766.

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

It is a cyclic number.

It is not a de Polignac number, because 66715121 - 2¹⁰ = 66714097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66715127) 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, 11156 + ... + 16058.

It is an arithmetic number, because the mean of its divisors is an integer number (9106728).

Almost surely, 2^66715121 is an apocalyptic number.

It is an amenable number.

66715121 is a deficient number, since it is larger than the sum of its proper divisors (6138703).

66715121 is a wasteful number, since it uses less digits than its factorization.

66715121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6151.

The product of its digits is 2520, while the sum is 29.

The square root of 66715121 is about 8167.9324801323. The cubic root of 66715121 is about 405.5783455956.

Adding to 66715121 its reverse (12151766), we get a palindrome (78866887).

The spelling of 66715121 in words is "sixty-six million, seven hundred fifteen thousand, one hundred twenty-one".