203186121553 has 2 divisors, whose sum is σ = 203186121554. Its totient is φ = 203186121552.

The previous prime is 203186121533. The next prime is 203186121569. The reversal of 203186121553 is 355121681302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149256277569 + 53929843984 = 386337^2 + 232228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203186121553 is a prime.

It is a super-2 number, since 2×203186121553² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203186121503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101593060776 + 101593060777.

It is an arithmetic number, because the mean of its divisors is an integer number (101593060777).

Almost surely, 2^203186121553 is an apocalyptic number.

It is an amenable number.

203186121553 is a deficient number, since it is larger than the sum of its proper divisors (1).

203186121553 is an equidigital number, since it uses as much as digits as its factorization.

203186121553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 203186121553 in words is "two hundred three billion, one hundred eighty-six million, one hundred twenty-one thousand, five hundred fifty-three".