861382220100 has 72 divisors (see below), whose sum is σ = 2492434307328. Its totient is φ = 229686403200.

The previous prime is 861382220093. The next prime is 861382220131. The reversal of 861382220100 is 1022283168.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4753357 + ... + 4931243.

Almost surely, 2^861382220100 is an apocalyptic number.

It is an amenable number.

861382220100 is an abundant number, since it is smaller than the sum of its proper divisors (1631052087228).

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

861382220100 is a wasteful number, since it uses less digits than its factorization.

861382220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194045 (or 194038 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 861382220100 in words is "eight hundred sixty-one billion, three hundred eighty-two million, two hundred twenty thousand, one hundred".