505546101989 has 2 divisors, whose sum is σ = 505546101990. Its totient is φ = 505546101988.

The previous prime is 505546101961. The next prime is 505546102093. The reversal of 505546101989 is 989101645505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505080276100 + 465825889 = 710690^2 + 21583^2 .

It is a cyclic number.

It is not a de Polignac number, because 505546101989 - 2⁸ = 505546101733 is a prime.

It is a super-2 number, since 2×505546101989² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 505546101989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505546101959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252773050994 + 252773050995.

It is an arithmetic number, because the mean of its divisors is an integer number (252773050995).

Almost surely, 2^505546101989 is an apocalyptic number.

It is an amenable number.

505546101989 is a deficient number, since it is larger than the sum of its proper divisors (1).

505546101989 is an equidigital number, since it uses as much as digits as its factorization.

505546101989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 505546101989 in words is "five hundred five billion, five hundred forty-six million, one hundred one thousand, nine hundred eighty-nine".