861468133631 has 24 divisors (see below), whose sum is σ = 1010646117936. Its totient is φ = 732140156160.

The previous prime is 861468133609. The next prime is 861468133633. The reversal of 861468133631 is 136331864168.

It is not a de Polignac number, because 861468133631 - 2¹⁰ = 861468132607 is a prime.

It is a super-2 number, since 2×861468133631² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861468133631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861468133633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2844740 + ... + 3132966.

It is an arithmetic number, because the mean of its divisors is an integer number (42110254914).

Almost surely, 2^861468133631 is an apocalyptic number.

861468133631 is a deficient number, since it is larger than the sum of its proper divisors (149177984305).

861468133631 is a wasteful number, since it uses less digits than its factorization.

861468133631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288759 (or 288752 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

Adding to 861468133631 its reverse (136331864168), we get a palindrome (997799997799).

The spelling of 861468133631 in words is "eight hundred sixty-one billion, four hundred sixty-eight million, one hundred thirty-three thousand, six hundred thirty-one".