801857848949 has 2 divisors, whose sum is σ = 801857848950. Its totient is φ = 801857848948.

The previous prime is 801857848933. The next prime is 801857849069. The reversal of 801857848949 is 949848758108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 463104748324 + 338753100625 = 680518^2 + 582025^2 .

It is a cyclic number.

It is not a de Polignac number, because 801857848949 - 2⁴ = 801857848933 is a prime.

It is a super-2 number, since 2×801857848949² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801857841949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400928924474 + 400928924475.

It is an arithmetic number, because the mean of its divisors is an integer number (400928924475).

Almost surely, 2^801857848949 is an apocalyptic number.

It is an amenable number.

801857848949 is a deficient number, since it is larger than the sum of its proper divisors (1).

801857848949 is an equidigital number, since it uses as much as digits as its factorization.

801857848949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185794560, while the sum is 71.

The spelling of 801857848949 in words is "eight hundred one billion, eight hundred fifty-seven million, eight hundred forty-eight thousand, nine hundred forty-nine".