61165601561 has 8 divisors (see below), whose sum is σ = 61685447040. Its totient is φ = 60646896432.

The previous prime is 61165601543. The next prime is 61165601573. The reversal of 61165601561 is 16510656116.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61165601561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61165601261) 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, 177185 + ... + 392078.

It is an arithmetic number, because the mean of its divisors is an integer number (7710680880).

Almost surely, 2^61165601561 is an apocalyptic number.

It is an amenable number.

61165601561 is a deficient number, since it is larger than the sum of its proper divisors (519845479).

61165601561 is a wasteful number, since it uses less digits than its factorization.

61165601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570175.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 61165601561 in words is "sixty-one billion, one hundred sixty-five million, six hundred one thousand, five hundred sixty-one".