61543513123 has 2 divisors, whose sum is σ = 61543513124. Its totient is φ = 61543513122.

The previous prime is 61543513117. The next prime is 61543513159. The reversal of 61543513123 is 32131534516.

61543513123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61543513123 - 2²⁹ = 61006642211 is a prime.

It is not a weakly prime, because it can be changed into another prime (61543513193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30771756561 + 30771756562.

It is an arithmetic number, because the mean of its divisors is an integer number (30771756562).

Almost surely, 2^61543513123 is an apocalyptic number.

61543513123 is a deficient number, since it is larger than the sum of its proper divisors (1).

61543513123 is an equidigital number, since it uses as much as digits as its factorization.

61543513123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The spelling of 61543513123 in words is "sixty-one billion, five hundred forty-three million, five hundred thirteen thousand, one hundred twenty-three".