42850501757981 has 2 divisors, whose sum is σ = 42850501757982. Its totient is φ = 42850501757980.

The previous prime is 42850501757923. The next prime is 42850501758059. The reversal of 42850501757981 is 18975710505824.

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., 38004031597081 + 4846470160900 = 6164741^2 + 2201470^2 .

It is a cyclic number.

It is not a de Polignac number, because 42850501757981 - 2³⁸ = 42575623851037 is a prime.

It is a super-2 number, since 2×42850501757981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42850501757681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21425250878990 + 21425250878991.

It is an arithmetic number, because the mean of its divisors is an integer number (21425250878991).

Almost surely, 2^{42850501757981} is an apocalyptic number.

It is an amenable number.

42850501757981 is a deficient number, since it is larger than the sum of its proper divisors (1).

42850501757981 is an equidigital number, since it uses as much as digits as its factorization.

42850501757981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224000, while the sum is 62.

The spelling of 42850501757981 in words is "forty-two trillion, eight hundred fifty billion, five hundred one million, seven hundred fifty-seven thousand, nine hundred eighty-one".