646259498077 has 8 divisors (see below), whose sum is σ = 670169916416. Its totient is φ = 622688234832.

The previous prime is 646259498057. The next prime is 646259498083. The reversal of 646259498077 is 770894952646.

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-646259498077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646259498057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84784893 + ... + 84792514.

It is an arithmetic number, because the mean of its divisors is an integer number (83771239552).

Almost surely, 2^646259498077 is an apocalyptic number.

It is an amenable number.

646259498077 is a deficient number, since it is larger than the sum of its proper divisors (23910418339).

646259498077 is a wasteful number, since it uses less digits than its factorization.

646259498077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169577547.

The product of its (nonzero) digits is 182891520, while the sum is 67.

The spelling of 646259498077 in words is "six hundred forty-six billion, two hundred fifty-nine million, four hundred ninety-eight thousand, seventy-seven".