42641857862789 has 2 divisors, whose sum is σ = 42641857862790. Its totient is φ = 42641857862788.

The previous prime is 42641857862761. The next prime is 42641857862801. The reversal of 42641857862789 is 98726875814624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39436264828900 + 3205593033889 = 6279830^2 + 1790417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42641857862789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42641857862719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21320928931394 + 21320928931395.

It is an arithmetic number, because the mean of its divisors is an integer number (21320928931395).

Almost surely, 2^{42641857862789} is an apocalyptic number.

It is an amenable number.

42641857862789 is a deficient number, since it is larger than the sum of its proper divisors (1).

42641857862789 is an equidigital number, since it uses as much as digits as its factorization.

42641857862789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2601123840, while the sum is 77.

The spelling of 42641857862789 in words is "forty-two trillion, six hundred forty-one billion, eight hundred fifty-seven million, eight hundred sixty-two thousand, seven hundred eighty-nine".