2143981746145 has 4 divisors (see below), whose sum is σ = 2572778095380. Its totient is φ = 1715185396912.

The previous prime is 2143981746143. The next prime is 2143981746199. The reversal of 2143981746145 is 5416471893412.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1466772898816 + 677208847329 = 1211104^2 + 822927^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143981746145 - 2¹ = 2143981746143 is a prime.

It is a super-2 number, since 2×2143981746145² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2143981746143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214398174610 + ... + 214398174619.

It is an arithmetic number, because the mean of its divisors is an integer number (643194523845).

Almost surely, 2^{2143981746145} is an apocalyptic number.

It is an amenable number.

2143981746145 is a deficient number, since it is larger than the sum of its proper divisors (428796349235).

2143981746145 is an equidigital number, since it uses as much as digits as its factorization.

2143981746145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428796349234.

The product of its digits is 5806080, while the sum is 55.

The spelling of 2143981746145 in words is "two trillion, one hundred forty-three billion, nine hundred eighty-one million, seven hundred forty-six thousand, one hundred forty-five".