42540436564477 has 2 divisors, whose sum is σ = 42540436564478. Its totient is φ = 42540436564476.

The previous prime is 42540436564421. The next prime is 42540436564559. The reversal of 42540436564477 is 77446563404524.

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., 36181536281881 + 6358900282596 = 6015109^2 + 2521686^2 .

It is a cyclic number.

It is not a de Polignac number, because 42540436564477 - 2¹⁹ = 42540436040189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42540436504477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21270218282238 + 21270218282239.

It is an arithmetic number, because the mean of its divisors is an integer number (21270218282239).

Almost surely, 2^{42540436564477} is an apocalyptic number.

It is an amenable number.

42540436564477 is a deficient number, since it is larger than the sum of its proper divisors (1).

42540436564477 is an equidigital number, since it uses as much as digits as its factorization.

42540436564477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270950400, while the sum is 61.

The spelling of 42540436564477 in words is "forty-two trillion, five hundred forty billion, four hundred thirty-six million, five hundred sixty-four thousand, four hundred seventy-seven".