2143944597538 has 8 divisors (see below), whose sum is σ = 3219567201900. Its totient is φ = 1070755530240.

The previous prime is 2143944597449. The next prime is 2143944597559. The reversal of 2143944597538 is 8357954493412.

It can be written as a sum of positive squares in 2 ways, for example, as 2044765582209 + 99179015329 = 1429953^2 + 314927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2143944597538² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2143944597538.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608382063 + ... + 608385586.

Almost surely, 2^{2143944597538} is an apocalyptic number.

2143944597538 is a deficient number, since it is larger than the sum of its proper divisors (1075622604362).

2143944597538 is a wasteful number, since it uses less digits than its factorization.

2143944597538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216768532.

The product of its digits is 130636800, while the sum is 64.

The spelling of 2143944597538 in words is "two trillion, one hundred forty-three billion, nine hundred forty-four million, five hundred ninety-seven thousand, five hundred thirty-eight".