61165601559 has 48 divisors (see below), whose sum is σ = 90769536000. Its totient is φ = 39679848000.

The previous prime is 61165601543. The next prime is 61165601573. The reversal of 61165601559 is 95510656116.

61165601559 is a `hidden beast` number, since 61 + 16 + 560 + 15 + 5 + 9 = 666.

It is not a de Polignac number, because 61165601559 - 2⁴ = 61165601543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61165601359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14062117 + ... + 14066465.

It is an arithmetic number, because the mean of its divisors is an integer number (1891032000).

Almost surely, 2^61165601559 is an apocalyptic number.

61165601559 is a deficient number, since it is larger than the sum of its proper divisors (29603934441).

61165601559 is a wasteful number, since it uses less digits than its factorization.

61165601559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716 (or 4713 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 61165601559 in words is "sixty-one billion, one hundred sixty-five million, six hundred one thousand, five hundred fifty-nine".