61494487573 has 2 divisors, whose sum is σ = 61494487574. Its totient is φ = 61494487572.

The previous prime is 61494487531. The next prime is 61494487589. The reversal of 61494487573 is 37578449416.

It is a happy number.

61494487573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51586674129 + 9907813444 = 227127^2 + 99538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61494487573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61494487513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30747243786 + 30747243787.

It is an arithmetic number, because the mean of its divisors is an integer number (30747243787).

Almost surely, 2^61494487573 is an apocalyptic number.

It is an amenable number.

61494487573 is a deficient number, since it is larger than the sum of its proper divisors (1).

61494487573 is an equidigital number, since it uses as much as digits as its factorization.

61494487573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 58.

The spelling of 61494487573 in words is "sixty-one billion, four hundred ninety-four million, four hundred eighty-seven thousand, five hundred seventy-three".