66261612 has 12 divisors (see below), whose sum is σ = 154610456. Its totient is φ = 22087200.

The previous prime is 66261599. The next prime is 66261649. The reversal of 66261612 is 21616266.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 66261612.

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, 2760889 + ... + 2760912.

Almost surely, 2^66261612 is an apocalyptic number.

It is an amenable number.

66261612 is an abundant number, since it is smaller than the sum of its proper divisors (88348844).

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

66261612 is a wasteful number, since it uses less digits than its factorization.

66261612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521808 (or 5521806 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 66261612 is about 8140.1235862854. The cubic root of 66261612 is about 404.6572561299.

Adding to 66261612 its reverse (21616266), we get a palindrome (87877878).

The spelling of 66261612 in words is "sixty-six million, two hundred sixty-one thousand, six hundred twelve".