66885572 has 12 divisors (see below), whose sum is σ = 126053676. Its totient is φ = 30870240.

The previous prime is 66885557. The next prime is 66885589. The reversal of 66885572 is 27558866.

It can be written as a sum of positive squares in 2 ways, for example, as 16532356 + 50353216 = 4066^2 + 7096^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643079 + ... + 643182.

It is an arithmetic number, because the mean of its divisors is an integer number (10504473).

Almost surely, 2^66885572 is an apocalyptic number.

It is an amenable number.

66885572 is a deficient number, since it is larger than the sum of its proper divisors (59168104).

66885572 is a wasteful number, since it uses less digits than its factorization.

66885572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286278 (or 1286276 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The square root of 66885572 is about 8178.3599822947. The cubic root of 66885572 is about 405.9234569802.

The spelling of 66885572 in words is "sixty-six million, eight hundred eighty-five thousand, five hundred seventy-two".