856661342148 has 18 divisors (see below), whose sum is σ = 2165449503854. Its totient is φ = 285553780704.

The previous prime is 856661342143. The next prime is 856661342161. The reversal of 856661342148 is 841243166658.

It can be written as a sum of positive squares in only one way, i.e., 695235780864 + 161425561284 = 833808^2 + 401778^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 856661342094 and 856661342103.

It is not an unprimeable number, because it can be changed into a prime (856661342143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11898074161 + ... + 11898074232.

Almost surely, 2^856661342148 is an apocalyptic number.

It is an amenable number.

856661342148 is an abundant number, since it is smaller than the sum of its proper divisors (1308788161706).

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

856661342148 is a wasteful number, since it uses less digits than its factorization.

856661342148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23796148403 (or 23796148398 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The spelling of 856661342148 in words is "eight hundred fifty-six billion, six hundred sixty-one million, three hundred forty-two thousand, one hundred forty-eight".