861872270646 has 16 divisors (see below), whose sum is σ = 1727483689008. Its totient is φ = 286667565600.

The previous prime is 861872270627. The next prime is 861872270647. The reversal of 861872270646 is 646072278168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861872270647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155794825 + ... + 155800356.

It is an arithmetic number, because the mean of its divisors is an integer number (107967730563).

Almost surely, 2^861872270646 is an apocalyptic number.

861872270646 is an abundant number, since it is smaller than the sum of its proper divisors (865611418362).

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

861872270646 is a wasteful number, since it uses less digits than its factorization.

861872270646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311595647.

The product of its (nonzero) digits is 10838016, while the sum is 57.

The spelling of 861872270646 in words is "eight hundred sixty-one billion, eight hundred seventy-two million, two hundred seventy thousand, six hundred forty-six".