861866237652 has 24 divisors (see below), whose sum is σ = 2298309967296. Its totient is φ = 246247496448.

The previous prime is 861866237633. The next prime is 861866237671. The reversal of 861866237652 is 256732668168.

It is an interprime number because it is at equal distance from previous prime (861866237633) and next prime (861866237671).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5130156093 + ... + 5130156260.

It is an arithmetic number, because the mean of its divisors is an integer number (95762915304).

Almost surely, 2^861866237652 is an apocalyptic number.

It is an amenable number.

861866237652 is an abundant number, since it is smaller than the sum of its proper divisors (1436443729644).

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

861866237652 is a wasteful number, since it uses less digits than its factorization.

861866237652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10260312367 (or 10260312365 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 60.

The spelling of 861866237652 in words is "eight hundred sixty-one billion, eight hundred sixty-six million, two hundred thirty-seven thousand, six hundred fifty-two".