1855740046821 has 16 divisors (see below), whose sum is σ = 2495038728000. Its totient is φ = 1226839426560.

The previous prime is 1855740046817. The next prime is 1855740046861. The reversal of 1855740046821 is 1286400475581.

It is a happy number.

It is not a de Polignac number, because 1855740046821 - 2² = 1855740046817 is a prime.

It is a super-2 number, since 2×1855740046821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855740046861) 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, 4649071 + ... + 5032428.

It is an arithmetic number, because the mean of its divisors is an integer number (155939920500).

Almost surely, 2^{1855740046821} is an apocalyptic number.

It is an amenable number.

1855740046821 is a deficient number, since it is larger than the sum of its proper divisors (639298681179).

1855740046821 is a wasteful number, since it uses less digits than its factorization.

1855740046821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9682036.

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 1855740046821 in words is "one trillion, eight hundred fifty-five billion, seven hundred forty million, forty-six thousand, eight hundred twenty-one".