1543515543397 has 2 divisors, whose sum is σ = 1543515543398. Its totient is φ = 1543515543396.

The previous prime is 1543515543343. The next prime is 1543515543403. The reversal of 1543515543397 is 7933455153451.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311370812801 + 232144730596 = 1145151^2 + 481814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1543515543397 - 2²⁷ = 1543381325669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1543515543307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771757771698 + 771757771699.

It is an arithmetic number, because the mean of its divisors is an integer number (771757771699).

Almost surely, 2^{1543515543397} is an apocalyptic number.

It is an amenable number.

1543515543397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543515543397 is an equidigital number, since it uses as much as digits as its factorization.

1543515543397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010000, while the sum is 55.

The spelling of 1543515543397 in words is "one trillion, five hundred forty-three billion, five hundred fifteen million, five hundred forty-three thousand, three hundred ninety-seven".