43542764549 has 2 divisors, whose sum is σ = 43542764550. Its totient is φ = 43542764548.

The previous prime is 43542764491. The next prime is 43542764611. The reversal of 43542764549 is 94546724534.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34592280100 + 8950484449 = 185990^2 + 94607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43542764549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43542764549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43542764849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21771382274 + 21771382275.

It is an arithmetic number, because the mean of its divisors is an integer number (21771382275).

Almost surely, 2^43542764549 is an apocalyptic number.

It is an amenable number.

43542764549 is a deficient number, since it is larger than the sum of its proper divisors (1).

43542764549 is an equidigital number, since it uses as much as digits as its factorization.

43542764549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 53.

The spelling of 43542764549 in words is "forty-three billion, five hundred forty-two million, seven hundred sixty-four thousand, five hundred forty-nine".