42991534336 has 27 divisors (see below), whose sum is σ = 85821755551. Its totient is φ = 21494108416.

The previous prime is 42991534321. The next prime is 42991534337. The reversal of 42991534336 is 63343519924.

The square root of 42991534336 is 207344.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42991534336.

It is not an unprimeable number, because it can be changed into a prime (42991534337) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3311025 + ... + 3323983.

Almost surely, 2^42991534336 is an apocalyptic number.

42991534336 is the 207344-th square number.

It is an amenable number.

42991534336 is a deficient number, since it is larger than the sum of its proper divisors (42830221215).

42991534336 is an frugal number, since it uses more digits than its factorization.

42991534336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25934 (or 12961 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 49.

Multiplying 42991534336 by its sum of digits (49), we get a square (2106585182464 = 1451408²).

The spelling of 42991534336 in words is "forty-two billion, nine hundred ninety-one million, five hundred thirty-four thousand, three hundred thirty-six".