61509139529 has 8 divisors (see below), whose sum is σ = 61610454528. Its totient is φ = 61407884880.

The previous prime is 61509139513. The next prime is 61509139579. The reversal of 61509139529 is 92593190516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61509139529 - 2⁴ = 61509139513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61509139579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2313944 + ... + 2340374.

It is an arithmetic number, because the mean of its divisors is an integer number (7701306816).

Almost surely, 2^61509139529 is an apocalyptic number.

It is an amenable number.

61509139529 is a deficient number, since it is larger than the sum of its proper divisors (101314999).

61509139529 is a wasteful number, since it uses less digits than its factorization.

61509139529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30175.

The product of its (nonzero) digits is 656100, while the sum is 50.

The spelling of 61509139529 in words is "sixty-one billion, five hundred nine million, one hundred thirty-nine thousand, five hundred twenty-nine".