61605665606 has 4 divisors (see below), whose sum is σ = 92408498412. Its totient is φ = 30802832802.

The previous prime is 61605665579. The next prime is 61605665659. The reversal of 61605665606 is 60656650616.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15401416400 + ... + 15401416403.

It is an arithmetic number, because the mean of its divisors is an integer number (23102124603).

Almost surely, 2^61605665606 is an apocalyptic number.

61605665606 is a deficient number, since it is larger than the sum of its proper divisors (30802832806).

61605665606 is a wasteful number, since it uses less digits than its factorization.

61605665606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30802832805.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 61605665606 in words is "sixty-one billion, six hundred five million, six hundred sixty-five thousand, six hundred six".