861645583288 has 16 divisors (see below), whose sum is σ = 1846383392880. Its totient is φ = 369276678528.

The previous prime is 861645583277. The next prime is 861645583301. The reversal of 861645583288 is 882385546168.

It is a super-2 number, since 2×861645583288² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7693264081 + ... + 7693264192.

It is an arithmetic number, because the mean of its divisors is an integer number (115398962055).

Almost surely, 2^861645583288 is an apocalyptic number.

It is an amenable number.

861645583288 is an abundant number, since it is smaller than the sum of its proper divisors (984737809592).

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

861645583288 is a wasteful number, since it uses less digits than its factorization.

861645583288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15386528286 (or 15386528282 counting only the distinct ones).

The product of its digits is 88473600, while the sum is 64.

The spelling of 861645583288 in words is "eight hundred sixty-one billion, six hundred forty-five million, five hundred eighty-three thousand, two hundred eighty-eight".