861403274500 has 48 divisors (see below), whose sum is σ = 1913191338240. Its totient is φ = 338721276000.

The previous prime is 861403274489. The next prime is 861403274503. The reversal of 861403274500 is 5472304168.

It is not an unprimeable number, because it can be changed into a prime (861403274503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14570556 + ... + 14629555.

It is an arithmetic number, because the mean of its divisors is an integer number (39858152880).

Almost surely, 2^861403274500 is an apocalyptic number.

It is an amenable number.

861403274500 is an abundant number, since it is smaller than the sum of its proper divisors (1051788063740).

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

861403274500 is a wasteful number, since it uses less digits than its factorization.

861403274500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29200189 (or 29200177 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

Adding to 861403274500 its reverse (5472304168), we get a palindrome (866875578668).

The spelling of 861403274500 in words is "eight hundred sixty-one billion, four hundred three million, two hundred seventy-four thousand, five hundred".