42115644213637 has 2 divisors, whose sum is σ = 42115644213638. Its totient is φ = 42115644213636.

The previous prime is 42115644213589. The next prime is 42115644213719. The reversal of 42115644213637 is 73631244651124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33887661758721 + 8227982454916 = 5821311^2 + 2868446^2 .

It is a cyclic number.

It is not a de Polignac number, because 42115644213637 - 2⁷ = 42115644213509 is a prime.

It is a super-4 number, since 4×42115644213637⁴ (a number of 56 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42115644213737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21057822106818 + 21057822106819.

It is an arithmetic number, because the mean of its divisors is an integer number (21057822106819).

Almost surely, 2^{42115644213637} is an apocalyptic number.

It is an amenable number.

42115644213637 is a deficient number, since it is larger than the sum of its proper divisors (1).

42115644213637 is an equidigital number, since it uses as much as digits as its factorization.

42115644213637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 49.

The spelling of 42115644213637 in words is "forty-two trillion, one hundred fifteen billion, six hundred forty-four million, two hundred thirteen thousand, six hundred thirty-seven".