1855820645028 has 168 divisors, whose sum is σ = 5586585389952. Its totient is φ = 528169807872.

The previous prime is 1855820644987. The next prime is 1855820645039. The reversal of 1855820645028 is 8205460285581.

1855820645028 is a `hidden beast` number, since 1 + 8 + 5 + 58 + 20 + 64 + 502 + 8 = 666.

It is a super-2 number, since 2×1855820645028² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 5069001 + ... + 5422767.

It is an arithmetic number, because the mean of its divisors is an integer number (33253484464).

Almost surely, 2^{1855820645028} is an apocalyptic number.

1855820645028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1855820645028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2793292694976).

1855820645028 is an abundant number, since it is smaller than the sum of its proper divisors (3730764744924).

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

1855820645028 is a wasteful number, since it uses less digits than its factorization.

1855820645028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354053 (or 354036 counting only the distinct ones).

The product of its (nonzero) digits is 6144000, while the sum is 54.

The spelling of 1855820645028 in words is "one trillion, eight hundred fifty-five billion, eight hundred twenty million, six hundred forty-five thousand, twenty-eight".