1865478021120 has 896 divisors, whose sum is σ = 7686054305280. Its totient is φ = 420426547200.

The previous prime is 1865478021119. The next prime is 1865478021137. The reversal of 1865478021120 is 211208745681.

1865478021120 is a `hidden beast` number, since 1 + 8 + 6 + 547 + 80 + 2 + 1 + 1 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 565123470 + ... + 565126770.

Almost surely, 2^{1865478021120} is an apocalyptic number.

1865478021120 is a gapful number since it is divisible by the number (10) 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 1865478021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3843027152640).

1865478021120 is an abundant number, since it is smaller than the sum of its proper divisors (5820576284160).

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

1865478021120 is an equidigital number, since it uses as much as digits as its factorization.

1865478021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421 (or 3391 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 1865478021120 in words is "one trillion, eight hundred sixty-five billion, four hundred seventy-eight million, twenty-one thousand, one hundred twenty".