61605711727 has 8 divisors (see below), whose sum is σ = 71843396000. Its totient is φ = 52804895472.

The previous prime is 61605711719. The next prime is 61605711763. The reversal of 61605711727 is 72711750616.

It is not a de Polignac number, because 61605711727 - 2³ = 61605711719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605711127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89803902 + ... + 89804587.

It is an arithmetic number, because the mean of its divisors is an integer number (8980424500).

Almost surely, 2^61605711727 is an apocalyptic number.

61605711727 is a deficient number, since it is larger than the sum of its proper divisors (10237684273).

61605711727 is an equidigital number, since it uses as much as digits as its factorization.

61605711727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179608510 (or 179608496 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 43.

The spelling of 61605711727 in words is "sixty-one billion, six hundred five million, seven hundred eleven thousand, seven hundred twenty-seven".