1954843672321 has 4 divisors (see below), whose sum is σ = 1961900869972. Its totient is φ = 1947786474672.

The previous prime is 1954843672303. The next prime is 1954843672351. The reversal of 1954843672321 is 1232763484591.

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 147260225025 + 1807583447296 = 383745^2 + 1344464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954843672321 - 2²⁹ = 1954306801409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954843672351) 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, 3528598410 + ... + 3528598963.

It is an arithmetic number, because the mean of its divisors is an integer number (490475217493).

Almost surely, 2^{1954843672321} is an apocalyptic number.

It is an amenable number.

1954843672321 is a deficient number, since it is larger than the sum of its proper divisors (7057197651).

1954843672321 is an equidigital number, since it uses as much as digits as its factorization.

1954843672321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7057197650.

The product of its digits is 8709120, while the sum is 55.

The spelling of 1954843672321 in words is "one trillion, nine hundred fifty-four billion, eight hundred forty-three million, six hundred seventy-two thousand, three hundred twenty-one".