66618530 has 32 divisors (see below), whose sum is σ = 131785920. Its totient is φ = 24045120.

The previous prime is 66618523. The next prime is 66618571. The reversal of 66618530 is 3581666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13112 + ... + 17468.

It is an arithmetic number, because the mean of its divisors is an integer number (4118310).

Almost surely, 2^66618530 is an apocalyptic number.

66618530 is a deficient number, since it is larger than the sum of its proper divisors (65167390).

66618530 is a wasteful number, since it uses less digits than its factorization.

66618530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4514.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 66618530 is about 8162.0175201968. The cubic root of 66618530 is about 405.3825172299.

The spelling of 66618530 in words is "sixty-six million, six hundred eighteen thousand, five hundred thirty".