66604274621 has 8 divisors (see below), whose sum is σ = 69563841984. Its totient is φ = 63650018080.

The previous prime is 66604274609. The next prime is 66604274689. The reversal of 66604274621 is 12647240666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66604274621 is a prime.

It is a super-2 number, since 2×66604274621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604274921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302056 + ... + 1352241.

It is an arithmetic number, because the mean of its divisors is an integer number (8695480248).

Almost surely, 2^66604274621 is an apocalyptic number.

It is an amenable number.

66604274621 is a deficient number, since it is larger than the sum of its proper divisors (2959567363).

66604274621 is a wasteful number, since it uses less digits than its factorization.

66604274621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655411.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 66604274621 in words is "sixty-six billion, six hundred four million, two hundred seventy-four thousand, six hundred twenty-one".