66253121 has 8 divisors (see below), whose sum is σ = 73267104. Its totient is φ = 59404320.

The previous prime is 66253079. The next prime is 66253123. The reversal of 66253121 is 12135266.

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 66253121 - 2¹⁰ = 66252097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66253123) 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, 40451 + ... + 42056.

It is an arithmetic number, because the mean of its divisors is an integer number (9158388).

Almost surely, 2^66253121 is an apocalyptic number.

It is an amenable number.

66253121 is a deficient number, since it is larger than the sum of its proper divisors (7013983).

66253121 is a wasteful number, since it uses less digits than its factorization.

66253121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82591.

The product of its digits is 2160, while the sum is 26.

The square root of 66253121 is about 8139.6020172979. The cubic root of 66253121 is about 404.6399706488.

Adding to 66253121 its reverse (12135266), we get a palindrome (78388387).

The spelling of 66253121 in words is "sixty-six million, two hundred fifty-three thousand, one hundred twenty-one".