2159443643738 has 8 divisors (see below), whose sum is σ = 3350860826580. Its totient is φ = 1042490034880.

The previous prime is 2159443643737. The next prime is 2159443643783. The reversal of 2159443643738 is 8373463449512.

It can be written as a sum of positive squares in 2 ways, for example, as 2017771953289 + 141671690449 = 1420483^2 + 376393^2 .

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

It is a super-2 number, since 2×2159443643738² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2159443643737) 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, 18615893423 + ... + 18615893538.

Almost surely, 2^{2159443643738} is an apocalyptic number.

2159443643738 is a deficient number, since it is larger than the sum of its proper divisors (1191417182842).

2159443643738 is a wasteful number, since it uses less digits than its factorization.

2159443643738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37231786992.

The product of its digits is 52254720, while the sum is 59.

The spelling of 2159443643738 in words is "two trillion, one hundred fifty-nine billion, four hundred forty-three million, six hundred forty-three thousand, seven hundred thirty-eight".