43918142557 has 4 divisors (see below), whose sum is σ = 45827627040. Its totient is φ = 42008658076.

The previous prime is 43918142519. The next prime is 43918142621. The reversal of 43918142557 is 75524181934.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43918142557 - 2²⁷ = 43783924829 is a prime.

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 43918142557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43918140557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954742207 + ... + 954742252.

It is an arithmetic number, because the mean of its divisors is an integer number (11456906760).

Almost surely, 2^43918142557 is an apocalyptic number.

It is an amenable number.

43918142557 is a deficient number, since it is larger than the sum of its proper divisors (1909484483).

43918142557 is a wasteful number, since it uses less digits than its factorization.

43918142557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909484482.

The product of its digits is 1209600, while the sum is 49.

The spelling of 43918142557 in words is "forty-three billion, nine hundred eighteen million, one hundred forty-two thousand, five hundred fifty-seven".