43540143691 has 16 divisors (see below), whose sum is σ = 50373740160. Its totient is φ = 37193316480.

The previous prime is 43540143677. The next prime is 43540143707. The reversal of 43540143691 is 19634104534.

43540143691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43540143691 is a prime.

It is a super-2 number, since 2×43540143691² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43540143991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72321 + ... + 303826.

It is an arithmetic number, because the mean of its divisors is an integer number (3148358760).

Almost surely, 2^43540143691 is an apocalyptic number.

43540143691 is a deficient number, since it is larger than the sum of its proper divisors (6833596469).

43540143691 is a wasteful number, since it uses less digits than its factorization.

43540143691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376794.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 43540143691 in words is "forty-three billion, five hundred forty million, one hundred forty-three thousand, six hundred ninety-one".