1856201120181 has 24 divisors (see below), whose sum is σ = 2826176400320. Its totient is φ = 1170724902336.

The previous prime is 1856201120119. The next prime is 1856201120227. The reversal of 1856201120181 is 1810211026581.

1856201120181 is a `hidden beast` number, since 1 + 8 + 5 + 620 + 1 + 1 + 20 + 1 + 8 + 1 = 666.

It is not a de Polignac number, because 1856201120181 - 2²⁶ = 1856134011317 is a prime.

It is a super-2 number, since 2×1856201120181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856201120381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7341280 + ... + 7589913.

Almost surely, 2^{1856201120181} is an apocalyptic number.

It is an amenable number.

1856201120181 is a deficient number, since it is larger than the sum of its proper divisors (969975280139).

1856201120181 is a wasteful number, since it uses less digits than its factorization.

1856201120181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14931945 (or 14931942 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 36.

The spelling of 1856201120181 in words is "one trillion, eight hundred fifty-six billion, two hundred one million, one hundred twenty thousand, one hundred eighty-one".