866139900548 has 48 divisors (see below), whose sum is σ = 1673934640560. Its totient is φ = 389591347200.

The previous prime is 866139900547. The next prime is 866139900607. The reversal of 866139900548 is 845009931668.

It can be written as a sum of positive squares in 8 ways, for example, as 9197193604 + 856942706944 = 95902^2 + 925712^2 .

It is not an unprimeable number, because it can be changed into a prime (866139900541) 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, 1790348 + ... + 2222076.

It is an arithmetic number, because the mean of its divisors is an integer number (34873638345).

Almost surely, 2^866139900548 is an apocalyptic number.

It is an amenable number.

866139900548 is a deficient number, since it is larger than the sum of its proper divisors (807794740012).

866139900548 is a wasteful number, since it uses less digits than its factorization.

866139900548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432728 (or 432726 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 866139900548 in words is "eight hundred sixty-six billion, one hundred thirty-nine million, nine hundred thousand, five hundred forty-eight".