1856663979276 has 144 divisors (see below), whose sum is σ = 4742336077920. Its totient is φ = 564815462400.

The previous prime is 1856663979263. The next prime is 1856663979277. The reversal of 1856663979276 is 6729793666581.

It is a super-2 number, since 2×1856663979276² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1856663979198 and 1856663979207.

It is not an unprimeable number, because it can be changed into a prime (1856663979277) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16131340 + ... + 16246028.

It is an arithmetic number, because the mean of its divisors is an integer number (32932889430).

Almost surely, 2^{1856663979276} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1856663979276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371168038960).

1856663979276 is an abundant number, since it is smaller than the sum of its proper divisors (2885672098644).

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

1856663979276 is a wasteful number, since it uses less digits than its factorization.

1856663979276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114872 (or 114851 counting only the distinct ones).

The product of its digits is 1234517760, while the sum is 75.

The spelling of 1856663979276 in words is "one trillion, eight hundred fifty-six billion, six hundred sixty-three million, nine hundred seventy-nine thousand, two hundred seventy-six".