61665500611 has 24 divisors (see below), whose sum is σ = 73565692560. Its totient is φ = 51234768000.

The previous prime is 61665500593. The next prime is 61665500623. The reversal of 61665500611 is 11600556616.

It is a de Polignac number, because none of the positive numbers 2^k-61665500611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61665300611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23545 + ... + 351973.

It is an arithmetic number, because the mean of its divisors is an integer number (3065237190).

Almost surely, 2^61665500611 is an apocalyptic number.

61665500611 is a deficient number, since it is larger than the sum of its proper divisors (11900191949).

61665500611 is a wasteful number, since it uses less digits than its factorization.

61665500611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328567 (or 328554 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 61665500611 in words is "sixty-one billion, six hundred sixty-five million, five hundred thousand, six hundred eleven".