861138017802 has 48 divisors (see below), whose sum is σ = 1896389614080. Its totient is φ = 282366583200.

The previous prime is 861138017791. The next prime is 861138017807. The reversal of 861138017802 is 208710831168.

It is a happy number.

It is a super-2 number, since 2×861138017802² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861138017807) 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, 731949 + ... + 1502672.

It is an arithmetic number, because the mean of its divisors is an integer number (39508116960).

Almost surely, 2^861138017802 is an apocalyptic number.

861138017802 is an abundant number, since it is smaller than the sum of its proper divisors (1035251596278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861138017802 is a wasteful number, since it uses less digits than its factorization.

861138017802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234979 (or 2234976 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 861138017802 in words is "eight hundred sixty-one billion, one hundred thirty-eight million, seventeen thousand, eight hundred two".