66073281 has 8 divisors (see below), whose sum is σ = 91135680. Its totient is φ = 42529872.

The previous prime is 66073243. The next prime is 66073289. The reversal of 66073281 is 18237066.

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

It is not a de Polignac number, because 66073281 - 2⁷ = 66073153 is a prime.

It is a super-2 number, since 2×66073281² = 8731356924209922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66073289) 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, 379645 + ... + 379818.

It is an arithmetic number, because the mean of its divisors is an integer number (11391960).

Almost surely, 2^66073281 is an apocalyptic number.

It is an amenable number.

66073281 is a deficient number, since it is larger than the sum of its proper divisors (25062399).

66073281 is a wasteful number, since it uses less digits than its factorization.

66073281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759495.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 66073281 is about 8128.5472871848. The cubic root of 66073281 is about 404.2735154824.

The spelling of 66073281 in words is "sixty-six million, seventy-three thousand, two hundred eighty-one".