646180796329 has 4 divisors (see below), whose sum is σ = 654360300160. Its totient is φ = 638001292500.

The previous prime is 646180796281. The next prime is 646180796423. The reversal of 646180796329 is 923697081646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646180796329 - 2⁷ = 646180796201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646180296329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4089751797 + ... + 4089751954.

It is an arithmetic number, because the mean of its divisors is an integer number (163590075040).

Almost surely, 2^646180796329 is an apocalyptic number.

It is an amenable number.

646180796329 is a deficient number, since it is larger than the sum of its proper divisors (8179503831).

646180796329 is an equidigital number, since it uses as much as digits as its factorization.

646180796329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8179503830.

The product of its (nonzero) digits is 23514624, while the sum is 61.

The spelling of 646180796329 in words is "six hundred forty-six billion, one hundred eighty million, seven hundred ninety-six thousand, three hundred twenty-nine".