66659481 has 48 divisors (see below), whose sum is σ = 114162048. Its totient is φ = 36691200.

The previous prime is 66659477. The next prime is 66659501. The reversal of 66659481 is 18495666.

It is not a de Polignac number, because 66659481 - 2² = 66659477 is a prime.

It is a super-2 number, since 2×66659481² = 8886972814378722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66659981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338275 + ... + 338471.

It is an arithmetic number, because the mean of its divisors is an integer number (2378376).

Almost surely, 2^66659481 is an apocalyptic number.

It is an amenable number.

66659481 is a deficient number, since it is larger than the sum of its proper divisors (47502567).

66659481 is a wasteful number, since it uses less digits than its factorization.

66659481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66659481 is about 8164.5257669996. The cubic root of 66659481 is about 405.4655642894.

The spelling of 66659481 in words is "sixty-six million, six hundred fifty-nine thousand, four hundred eighty-one".