501958643881 has 2 divisors, whose sum is σ = 501958643882. Its totient is φ = 501958643880.

The previous prime is 501958643839. The next prime is 501958643887. The reversal of 501958643881 is 188346859105.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313954019856 + 188004624025 = 560316^2 + 433595^2 .

It is a cyclic number.

It is not a de Polignac number, because 501958643881 - 2⁹ = 501958643369 is a prime.

It is a super-2 number, since 2×501958643881² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (501958643887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250979321940 + 250979321941.

It is an arithmetic number, because the mean of its divisors is an integer number (250979321941).

Almost surely, 2^501958643881 is an apocalyptic number.

It is an amenable number.

501958643881 is a deficient number, since it is larger than the sum of its proper divisors (1).

501958643881 is an equidigital number, since it uses as much as digits as its factorization.

501958643881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8294400, while the sum is 58.

The spelling of 501958643881 in words is "five hundred one billion, nine hundred fifty-eight million, six hundred forty-three thousand, eight hundred eighty-one".