2145185281736 has 96 divisors (see below), whose sum is σ = 4715507634840. Its totient is φ = 912181358592.

The previous prime is 2145185281711. The next prime is 2145185281753. The reversal of 2145185281736 is 6371825815412.

It can be written as a sum of positive squares in 4 ways, for example, as 899519464900 + 1245665816836 = 948430^2 + 1116094^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115615436 + ... + 115633988.

Almost surely, 2^{2145185281736} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145185281736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2357753817420).

2145185281736 is an abundant number, since it is smaller than the sum of its proper divisors (2570322353104).

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

2145185281736 is a wasteful number, since it uses less digits than its factorization.

2145185281736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20863 (or 20852 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 53.

The spelling of 2145185281736 in words is "two trillion, one hundred forty-five billion, one hundred eighty-five million, two hundred eighty-one thousand, seven hundred thirty-six".