61604577749 has 16 divisors (see below), whose sum is σ = 72607377024. Its totient is φ = 51529886400.

The previous prime is 61604577731. The next prime is 61604577751. The reversal of 61604577749 is 94777540616.

It is a cyclic number.

It is not a de Polignac number, because 61604577749 - 2¹⁶ = 61604512213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61604577694 and 61604577703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61604577149) 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, 648134 + ... + 737079.

It is an arithmetic number, because the mean of its divisors is an integer number (4537961064).

Almost surely, 2^61604577749 is an apocalyptic number.

It is an amenable number.

61604577749 is a deficient number, since it is larger than the sum of its proper divisors (11002799275).

61604577749 is a wasteful number, since it uses less digits than its factorization.

61604577749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385548.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 61604577749 in words is "sixty-one billion, six hundred four million, five hundred seventy-seven thousand, seven hundred forty-nine".