2145820011487 has 4 divisors (see below), whose sum is σ = 2147257266840. Its totient is φ = 2144382756136.

The previous prime is 2145820011481. The next prime is 2145820011499. The reversal of 2145820011487 is 7841100285412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2145820011487 - 2¹¹ = 2145820009439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145820011481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718625437 + ... + 718628422.

It is an arithmetic number, because the mean of its divisors is an integer number (536814316710).

Almost surely, 2^{2145820011487} is an apocalyptic number.

2145820011487 is a deficient number, since it is larger than the sum of its proper divisors (1437255353).

2145820011487 is a wasteful number, since it uses less digits than its factorization.

2145820011487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437255352.

The product of its (nonzero) digits is 143360, while the sum is 43.

Adding to 2145820011487 its reverse (7841100285412), we get a palindrome (9986920296899).

The spelling of 2145820011487 in words is "two trillion, one hundred forty-five billion, eight hundred twenty million, eleven thousand, four hundred eighty-seven".