66528618 has 32 divisors (see below), whose sum is σ = 143640000. Its totient is φ = 20420736.

The previous prime is 66528617. The next prime is 66528619. The reversal of 66528618 is 81682566.

It is an interprime number because it is at equal distance from previous prime (66528617) and next prime (66528619).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66528618.

It is not an unprimeable number, because it can be changed into a prime (66528617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43633 + ... + 45131.

It is an arithmetic number, because the mean of its divisors is an integer number (4488750).

Almost surely, 2^66528618 is an apocalyptic number.

66528618 is an abundant number, since it is smaller than the sum of its proper divisors (77111382).

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

66528618 is a wasteful number, since it uses less digits than its factorization.

66528618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086.

The product of its digits is 138240, while the sum is 42.

The square root of 66528618 is about 8156.5077085723. The cubic root of 66528618 is about 405.2000596718.

The spelling of 66528618 in words is "sixty-six million, five hundred twenty-eight thousand, six hundred eighteen".