197913646253 has 2 divisors, whose sum is σ = 197913646254. Its totient is φ = 197913646252.

The previous prime is 197913646219. The next prime is 197913646277. The reversal of 197913646253 is 352646319791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142746441124 + 55167205129 = 377818^2 + 234877^2 .

It is a cyclic number.

It is not a de Polignac number, because 197913646253 - 2¹⁶ = 197913580717 is a prime.

It is a super-2 number, since 2×197913646253² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197913646753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98956823126 + 98956823127.

It is an arithmetic number, because the mean of its divisors is an integer number (98956823127).

Almost surely, 2^197913646253 is an apocalyptic number.

It is an amenable number.

197913646253 is a deficient number, since it is larger than the sum of its proper divisors (1).

197913646253 is an equidigital number, since it uses as much as digits as its factorization.

197913646253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 56.

The spelling of 197913646253 in words is "one hundred ninety-seven billion, nine hundred thirteen million, six hundred forty-six thousand, two hundred fifty-three".