646156521617 has 8 divisors (see below), whose sum is σ = 646737396480. Its totient is φ = 645575827680.

The previous prime is 646156521551. The next prime is 646156521631. The reversal of 646156521617 is 716125651646.

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 646156521617 - 2¹⁶ = 646156456081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646156521217) 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, 7686509 + ... + 7770117.

It is an arithmetic number, because the mean of its divisors is an integer number (80842174560).

Almost surely, 2^646156521617 is an apocalyptic number.

It is an amenable number.

646156521617 is a deficient number, since it is larger than the sum of its proper divisors (580874863).

646156521617 is a wasteful number, since it uses less digits than its factorization.

646156521617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90463.

The product of its digits is 1814400, while the sum is 50.

The spelling of 646156521617 in words is "six hundred forty-six billion, one hundred fifty-six million, five hundred twenty-one thousand, six hundred seventeen".