43542520065 has 24 divisors (see below), whose sum is σ = 82334947968. Its totient is φ = 21111524640.

The previous prime is 43542520057. The next prime is 43542520093. The reversal of 43542520065 is 56002524534.

43542520065 is a `hidden beast` number, since 4 + 3 + 542 + 52 + 0 + 0 + 65 = 666.

It is not a de Polignac number, because 43542520065 - 2³ = 43542520057 is a prime.

It is a super-2 number, since 2×43542520065² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43981849 + ... + 43982838.

It is an arithmetic number, because the mean of its divisors is an integer number (3430622832).

Almost surely, 2^43542520065 is an apocalyptic number.

43542520065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43542520065 is a deficient number, since it is larger than the sum of its proper divisors (38792427903).

43542520065 is a wasteful number, since it uses less digits than its factorization.

43542520065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87964709 (or 87964706 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 43542520065 in words is "forty-three billion, five hundred forty-two million, five hundred twenty thousand, sixty-five".