209873739553 has 2 divisors, whose sum is σ = 209873739554. Its totient is φ = 209873739552.

The previous prime is 209873739487. The next prime is 209873739601. The reversal of 209873739553 is 355937378902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112649510689 + 97224228864 = 335633^2 + 311808^2 .

It is a cyclic number.

It is not a de Polignac number, because 209873739553 - 2³³ = 201283804961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209873739491 and 209873739500.

It is not a weakly prime, because it can be changed into another prime (209873739253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104936869776 + 104936869777.

It is an arithmetic number, because the mean of its divisors is an integer number (104936869777).

Almost surely, 2^209873739553 is an apocalyptic number.

It is an amenable number.

209873739553 is a deficient number, since it is larger than the sum of its proper divisors (1).

209873739553 is an equidigital number, since it uses as much as digits as its factorization.

209873739553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42865200, while the sum is 61.

The spelling of 209873739553 in words is "two hundred nine billion, eight hundred seventy-three million, seven hundred thirty-nine thousand, five hundred fifty-three".