61561500011 has 8 divisors (see below), whose sum is σ = 70077913344. Its totient is φ = 53531738920.

The previous prime is 61561500001. The next prime is 61561500017. The reversal of 61561500011 is 11000516516.

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

It is a de Polignac number, because none of the positive numbers 2^k-61561500011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61561500017) 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, 121662791 + ... + 121663296.

It is an arithmetic number, because the mean of its divisors is an integer number (8759739168).

Almost surely, 2^61561500011 is an apocalyptic number.

61561500011 is a deficient number, since it is larger than the sum of its proper divisors (8516413333).

61561500011 is a wasteful number, since it uses less digits than its factorization.

61561500011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243326121.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 61561500011 in words is "sixty-one billion, five hundred sixty-one million, five hundred thousand, eleven".