53398691693 has 2 divisors, whose sum is σ = 53398691694. Its totient is φ = 53398691692.

The previous prime is 53398691659. The next prime is 53398691699. The reversal of 53398691693 is 39619689335.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27419054569 + 25979637124 = 165587^2 + 161182^2 .

It is a cyclic number.

It is not a de Polignac number, because 53398691693 - 2¹² = 53398687597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53398691699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26699345846 + 26699345847.

It is an arithmetic number, because the mean of its divisors is an integer number (26699345847).

Almost surely, 2^53398691693 is an apocalyptic number.

It is an amenable number.

53398691693 is a deficient number, since it is larger than the sum of its proper divisors (1).

53398691693 is an equidigital number, since it uses as much as digits as its factorization.

53398691693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28343520, while the sum is 62.

The spelling of 53398691693 in words is "fifty-three billion, three hundred ninety-eight million, six hundred ninety-one thousand, six hundred ninety-three".