7543646507861 has 2 divisors, whose sum is σ = 7543646507862. Its totient is φ = 7543646507860.

The previous prime is 7543646507753. The next prime is 7543646507923. The reversal of 7543646507861 is 1687056463457.

It is a happy number.

7543646507861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (7543646507923) can be obtained adding 7543646507861 to its sum of digits (62).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6062399293636 + 1481247214225 = 2462194^2 + 1217065^2 .

It is a cyclic number.

It is not a de Polignac number, because 7543646507861 - 2¹⁴ = 7543646491477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7543646507794 and 7543646507803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7543646507161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771823253930 + 3771823253931.

It is an arithmetic number, because the mean of its divisors is an integer number (3771823253931).

Almost surely, 2^{7543646507861} is an apocalyptic number.

It is an amenable number.

7543646507861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7543646507861 is an equidigital number, since it uses as much as digits as its factorization.

7543646507861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 101606400, while the sum is 62.

The spelling of 7543646507861 in words is "seven trillion, five hundred forty-three billion, six hundred forty-six million, five hundred seven thousand, eight hundred sixty-one".