53138968397 has 2 divisors, whose sum is σ = 53138968398. Its totient is φ = 53138968396.

The previous prime is 53138968357. The next prime is 53138968423. The reversal of 53138968397 is 79386983135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45364314121 + 7774654276 = 212989^2 + 88174^2 .

It is a cyclic number.

It is not a de Polignac number, because 53138968397 - 2¹² = 53138964301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53138968307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26569484198 + 26569484199.

It is an arithmetic number, because the mean of its divisors is an integer number (26569484199).

Almost surely, 2^53138968397 is an apocalyptic number.

It is an amenable number.

53138968397 is a deficient number, since it is larger than the sum of its proper divisors (1).

53138968397 is an equidigital number, since it uses as much as digits as its factorization.

53138968397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 62.

The spelling of 53138968397 in words is "fifty-three billion, one hundred thirty-eight million, nine hundred sixty-eight thousand, three hundred ninety-seven".