66654481 has 8 divisors (see below), whose sum is σ = 68277440. Its totient is φ = 65050128.

The previous prime is 66654421. The next prime is 66654487. The reversal of 66654481 is 18445666.

It is a happy number.

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 66654481 - 2¹⁵ = 66621713 is a prime.

It is a super-2 number, since 2×66654481² = 8885639674758722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66654487) 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, 2740 + ... + 11866.

It is an arithmetic number, because the mean of its divisors is an integer number (8534680).

Almost surely, 2^66654481 is an apocalyptic number.

It is an amenable number.

66654481 is a deficient number, since it is larger than the sum of its proper divisors (1622959).

66654481 is a wasteful number, since it uses less digits than its factorization.

66654481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9303.

The product of its digits is 138240, while the sum is 40.

The square root of 66654481 is about 8164.2195585371. The cubic root of 66654481 is about 405.4554263041.

The spelling of 66654481 in words is "sixty-six million, six hundred fifty-four thousand, four hundred eighty-one".