66012808 has 8 divisors (see below), whose sum is σ = 123774030. Its totient is φ = 33006400.

The previous prime is 66012767. The next prime is 66012809. The reversal of 66012808 is 80821066.

It can be written as a sum of positive squares in only one way, i.e., 63329764 + 2683044 = 7958^2 + 1638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66012808.

It is not an unprimeable number, because it can be changed into a prime (66012809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4125793 + ... + 4125808.

Almost surely, 2^66012808 is an apocalyptic number.

It is an amenable number.

66012808 is a deficient number, since it is larger than the sum of its proper divisors (57761222).

66012808 is a wasteful number, since it uses less digits than its factorization.

66012808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8251607 (or 8251603 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 66012808 is about 8124.8266443045. The cubic root of 66012808 is about 404.1501418876.

It can be divided in two parts, 6601 and 2808, that added together give a square (9409 = 97²).

The spelling of 66012808 in words is "sixty-six million, twelve thousand, eight hundred eight".