1856448836381 has 4 divisors (see below), whose sum is σ = 1856819908512. Its totient is φ = 1856077764252.

The previous prime is 1856448836369. The next prime is 1856448836387. The reversal of 1856448836381 is 1836388446581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1856448836381 - 2¹⁰ = 1856448835357 is a prime.

It is a super-2 number, since 2×1856448836381² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856448836387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185528561 + ... + 185538566.

It is an arithmetic number, because the mean of its divisors is an integer number (464204977128).

Almost surely, 2^{1856448836381} is an apocalyptic number.

It is an amenable number.

1856448836381 is a deficient number, since it is larger than the sum of its proper divisors (371072131).

1856448836381 is an equidigital number, since it uses as much as digits as its factorization.

1856448836381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371072130.

The product of its digits is 106168320, while the sum is 65.

The spelling of 1856448836381 in words is "one trillion, eight hundred fifty-six billion, four hundred forty-eight million, eight hundred thirty-six thousand, three hundred eighty-one".