61505665011 has 64 divisors (see below), whose sum is σ = 107157872640. Its totient is φ = 34134151680.

The previous prime is 61505665009. The next prime is 61505665019. The reversal of 61505665011 is 11056650516.

It is not a de Polignac number, because 61505665011 - 2¹ = 61505665009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61505665019) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1710231 + ... + 1745823.

It is an arithmetic number, because the mean of its divisors is an integer number (1674341760).

Almost surely, 2^61505665011 is an apocalyptic number.

61505665011 is a deficient number, since it is larger than the sum of its proper divisors (45652207629).

61505665011 is a wasteful number, since it uses less digits than its factorization.

61505665011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35873 (or 35867 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 61505665011 in words is "sixty-one billion, five hundred five million, six hundred sixty-five thousand, eleven".