1642678543 has 8 divisors (see below), whose sum is σ = 1792425600. Its totient is φ = 1493000280.

The previous prime is 1642678537. The next prime is 1642678553. The reversal of 1642678543 is 3458762461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642678543 - 2¹⁷ = 1642547471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642678493 and 1642678502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642678553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41446 + ... + 70732.

It is an arithmetic number, because the mean of its divisors is an integer number (224053200).

Almost surely, 2^1642678543 is an apocalyptic number.

1642678543 is a deficient number, since it is larger than the sum of its proper divisors (149747057).

1642678543 is a wasteful number, since it uses less digits than its factorization.

1642678543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34397.

The product of its digits is 967680, while the sum is 46.

The square root of 1642678543 is about 40529.9709227628. The cubic root of 1642678543 is about 1179.9153781603.

The spelling of 1642678543 in words is "one billion, six hundred forty-two million, six hundred seventy-eight thousand, five hundred forty-three".