42878537145749 has 2 divisors, whose sum is σ = 42878537145750. Its totient is φ = 42878537145748.

The previous prime is 42878537145701. The next prime is 42878537145791. The reversal of 42878537145749 is 94754173587824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33473826921649 + 9404710224100 = 5785657^2 + 3066710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42878537145749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42878537145799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439268572874 + 21439268572875.

It is an arithmetic number, because the mean of its divisors is an integer number (21439268572875).

Almost surely, 2^{42878537145749} is an apocalyptic number.

It is an amenable number.

42878537145749 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878537145749 is an equidigital number, since it uses as much as digits as its factorization.

42878537145749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1896652800, while the sum is 74.

The spelling of 42878537145749 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred thirty-seven million, one hundred forty-five thousand, seven hundred forty-nine".