617105681621 has 48 divisors (see below), whose sum is σ = 796755460608. Its totient is φ = 471666124800.

The previous prime is 617105681573. The next prime is 617105681639. The reversal of 617105681621 is 126186501716.

It is not a de Polignac number, because 617105681621 - 2⁶ = 617105681557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617105681921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 664745 + ... + 1294641.

It is an arithmetic number, because the mean of its divisors is an integer number (16599072096).

Almost surely, 2^617105681621 is an apocalyptic number.

It is an amenable number.

617105681621 is a deficient number, since it is larger than the sum of its proper divisors (179649778987).

617105681621 is a wasteful number, since it uses less digits than its factorization.

617105681621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629982 (or 629969 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 617105681621 in words is "six hundred seventeen billion, one hundred five million, six hundred eighty-one thousand, six hundred twenty-one".