42543989494 has 4 divisors (see below), whose sum is σ = 63815984244. Its totient is φ = 21271994746.

The previous prime is 42543989471. The next prime is 42543989507. The reversal of 42543989494 is 49498934524.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10635997372 + ... + 10635997375.

It is an arithmetic number, because the mean of its divisors is an integer number (15953996061).

Almost surely, 2^42543989494 is an apocalyptic number.

42543989494 is a deficient number, since it is larger than the sum of its proper divisors (21271994750).

42543989494 is a wasteful number, since it uses less digits than its factorization.

42543989494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21271994749.

The product of its digits is 44789760, while the sum is 61.

The spelling of 42543989494 in words is "forty-two billion, five hundred forty-three million, nine hundred eighty-nine thousand, four hundred ninety-four".