61273567509 has 16 divisors (see below), whose sum is σ = 101857359360. Its totient is φ = 31830424560.

The previous prime is 61273567447. The next prime is 61273567529. The reversal of 61273567509 is 90576537216.

It is not a de Polignac number, because 61273567509 - 2⁸ = 61273567253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61273567529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132626539 + ... + 132627000.

It is an arithmetic number, because the mean of its divisors is an integer number (6366084960).

Almost surely, 2^61273567509 is an apocalyptic number.

It is an amenable number.

61273567509 is a deficient number, since it is larger than the sum of its proper divisors (40583791851).

61273567509 is a wasteful number, since it uses less digits than its factorization.

61273567509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265253560.

The product of its (nonzero) digits is 2381400, while the sum is 51.

The spelling of 61273567509 in words is "sixty-one billion, two hundred seventy-three million, five hundred sixty-seven thousand, five hundred nine".