66273665 has 8 divisors (see below), whose sum is σ = 79572480. Its totient is φ = 52989552.

The previous prime is 66273661. The next prime is 66273673. The reversal of 66273665 is 56637266.

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 66273665 - 2² = 66273661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66273661) 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, 13856 + ... + 18014.

It is an arithmetic number, because the mean of its divisors is an integer number (9946560).

Almost surely, 2^66273665 is an apocalyptic number.

It is an amenable number.

66273665 is a deficient number, since it is larger than the sum of its proper divisors (13298815).

66273665 is a wasteful number, since it uses less digits than its factorization.

66273665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351.

The product of its digits is 272160, while the sum is 41.

The square root of 66273665 is about 8140.8638976462. The cubic root of 66273665 is about 404.6817903867.

The spelling of 66273665 in words is "sixty-six million, two hundred seventy-three thousand, six hundred sixty-five".