66651612 has 48 divisors (see below), whose sum is σ = 161817600. Its totient is φ = 21329280.

The previous prime is 66651583. The next prime is 66651619. The reversal of 66651612 is 21615666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66651619) 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, 51064 + ... + 52352.

It is an arithmetic number, because the mean of its divisors is an integer number (3371200).

Almost surely, 2^66651612 is an apocalyptic number.

66651612 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

66651612 is an abundant number, since it is smaller than the sum of its proper divisors (95165988).

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

66651612 is a wasteful number, since it uses less digits than its factorization.

66651612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1464 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 66651612 is about 8164.0438509356. The cubic root of 66651612 is about 405.4496088992.

The spelling of 66651612 in words is "sixty-six million, six hundred fifty-one thousand, six hundred twelve".