684661220633 has 8 divisors (see below), whose sum is σ = 780699672648. Its totient is φ = 594818797824.

The previous prime is 684661220629. The next prime is 684661220641. The reversal of 684661220633 is 336022166486.

It can be written as a sum of positive squares in 4 ways, for example, as 283506197209 + 401155023424 = 532453^2 + 633368^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 684661220633 - 2² = 684661220629 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684661220693) 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, 1549007066 + ... + 1549007507.

It is an arithmetic number, because the mean of its divisors is an integer number (97587459081).

Almost surely, 2^684661220633 is an apocalyptic number.

It is an amenable number.

684661220633 is a deficient number, since it is larger than the sum of its proper divisors (96038452015).

684661220633 is a wasteful number, since it uses less digits than its factorization.

684661220633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3098014603.

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 684661220633 in words is "six hundred eighty-four billion, six hundred sixty-one million, two hundred twenty thousand, six hundred thirty-three".