646259497998 has 8 divisors (see below), whose sum is σ = 1292518996008. Its totient is φ = 215419832664.

The previous prime is 646259497997. The next prime is 646259497999. The reversal of 646259497998 is 899794952646.

It is an interprime number because it is at equal distance from previous prime (646259497997) and next prime (646259497999).

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

646259497998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646259497997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53854958161 + ... + 53854958172.

It is an arithmetic number, because the mean of its divisors is an integer number (161564874501).

Almost surely, 2^646259497998 is an apocalyptic number.

646259497998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646259497998 is a wasteful number, since it uses less digits than its factorization.

646259497998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107709916338.

The product of its digits is 2116316160, while the sum is 78.

The spelling of 646259497998 in words is "six hundred forty-six billion, two hundred fifty-nine million, four hundred ninety-seven thousand, nine hundred ninety-eight".