617881187851 has 12 divisors (see below), whose sum is σ = 638539895712. Its totient is φ = 597870774000.

The previous prime is 617881187849. The next prime is 617881187867. The reversal of 617881187851 is 158781188716.

It is not a de Polignac number, because 617881187851 - 2¹ = 617881187849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 617881187851.

It is not an unprimeable number, because it can be changed into a prime (617881187801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8064061 + ... + 8140321.

It is an arithmetic number, because the mean of its divisors is an integer number (53211657976).

Almost surely, 2^617881187851 is an apocalyptic number.

617881187851 is a deficient number, since it is larger than the sum of its proper divisors (20658707861).

617881187851 is an equidigital number, since it uses as much as digits as its factorization.

617881187851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84754 (or 84723 counting only the distinct ones).

The product of its digits is 6021120, while the sum is 61.

The spelling of 617881187851 in words is "six hundred seventeen billion, eight hundred eighty-one million, one hundred eighty-seven thousand, eight hundred fifty-one".