1855965037872 has 240 divisors, whose sum is σ = 5334858547200. Its totient is φ = 555538959360.

The previous prime is 1855965037859. The next prime is 1855965037877. The reversal of 1855965037872 is 2787305695581.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (1855965037877) 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, 171859129 + ... + 171869927.

It is an arithmetic number, because the mean of its divisors is an integer number (22228577280).

Almost surely, 2^{1855965037872} is an apocalyptic number.

1855965037872 is a gapful number since it is divisible by the number (12) 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 1855965037872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667429273600).

1855965037872 is an abundant number, since it is smaller than the sum of its proper divisors (3478893509328).

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

1855965037872 is a wasteful number, since it uses less digits than its factorization.

1855965037872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11192 (or 11175 counting only the distinct ones).

The product of its (nonzero) digits is 127008000, while the sum is 66.

The spelling of 1855965037872 in words is "one trillion, eight hundred fifty-five billion, nine hundred sixty-five million, thirty-seven thousand, eight hundred seventy-two".