66665460 has 24 divisors (see below), whose sum is σ = 186663456. Its totient is φ = 17777440.

The previous prime is 66665447. The next prime is 66665479. The reversal of 66665460 is 6456666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555486 + ... + 555605.

It is an arithmetic number, because the mean of its divisors is an integer number (7777644).

Almost surely, 2^66665460 is an apocalyptic number.

66665460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66665460 is an abundant number, since it is smaller than the sum of its proper divisors (119997996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66665460 is a wasteful number, since it uses less digits than its factorization.

66665460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111103 (or 1111101 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 66665460 is about 8164.8919160023. The cubic root of 66665460 is about 405.4776866267.

The spelling of 66665460 in words is "sixty-six million, six hundred sixty-five thousand, four hundred sixty".