43538638516 has 12 divisors (see below), whose sum is σ = 76217726788. Its totient is φ = 21762145152.

The previous prime is 43538638499. The next prime is 43538638547. The reversal of 43538638516 is 61583683534.

It can be written as a sum of positive squares in 2 ways, for example, as 24479731600 + 19058906916 = 156460^2 + 138054^2 .

It is a super-3 number, since 3×43538638516³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1779861 + ... + 1804156.

Almost surely, 2^43538638516 is an apocalyptic number.

It is an amenable number.

43538638516 is a deficient number, since it is larger than the sum of its proper divisors (32679088272).

43538638516 is a wasteful number, since it uses less digits than its factorization.

43538638516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587058 (or 3587056 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 52.

The spelling of 43538638516 in words is "forty-three billion, five hundred thirty-eight million, six hundred thirty-eight thousand, five hundred sixteen".