61210873509 has 32 divisors (see below), whose sum is σ = 84089465856. Its totient is φ = 39589482240.

The previous prime is 61210873487. The next prime is 61210873513. The reversal of 61210873509 is 90537801216.

61210873509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61210873509 - 2²³ = 61202484901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61210873109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18507834 + ... + 18511140.

It is an arithmetic number, because the mean of its divisors is an integer number (2627795808).

Almost surely, 2^61210873509 is an apocalyptic number.

It is an amenable number.

61210873509 is a deficient number, since it is larger than the sum of its proper divisors (22878592347).

61210873509 is a wasteful number, since it uses less digits than its factorization.

61210873509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4745.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 61210873509 in words is "sixty-one billion, two hundred ten million, eight hundred seventy-three thousand, five hundred nine".