66621612 has 12 divisors (see below), whose sum is σ = 155450456. Its totient is φ = 22207200.

The previous prime is 66621587. The next prime is 66621617. The reversal of 66621612 is 21612666.

66621612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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 66621612.

It is not an unprimeable number, because it can be changed into a prime (66621617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775889 + ... + 2775912.

Almost surely, 2^66621612 is an apocalyptic number.

It is an amenable number.

66621612 is an abundant number, since it is smaller than the sum of its proper divisors (88828844).

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

66621612 is a wasteful number, since it uses less digits than its factorization.

66621612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551808 (or 5551806 counting only the distinct ones).

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

The square root of 66621612 is about 8162.2063193722. The cubic root of 66621612 is about 405.3887685920.

The spelling of 66621612 in words is "sixty-six million, six hundred twenty-one thousand, six hundred twelve".