61604105439 has 4 divisors (see below), whose sum is σ = 82138807256. Its totient is φ = 41069403624.

The previous prime is 61604105401. The next prime is 61604105443. The reversal of 61604105439 is 93450140616.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61604105439 - 2⁹ = 61604104927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61604105397 and 61604105406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61604105449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10267350904 + ... + 10267350909.

It is an arithmetic number, because the mean of its divisors is an integer number (20534701814).

Almost surely, 2^61604105439 is an apocalyptic number.

61604105439 is a deficient number, since it is larger than the sum of its proper divisors (20534701817).

61604105439 is a wasteful number, since it uses less digits than its factorization.

61604105439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20534701816.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 61604105439 in words is "sixty-one billion, six hundred four million, one hundred five thousand, four hundred thirty-nine".