61600661111 has 4 divisors (see below), whose sum is σ = 67200721224. Its totient is φ = 56000601000.

The previous prime is 61600661063. The next prime is 61600661167. The reversal of 61600661111 is 11116600616.

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

It is a cyclic number.

It is not a de Polignac number, because 61600661111 - 2¹⁸ = 61600398967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61600661611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2800030040 + ... + 2800030061.

It is an arithmetic number, because the mean of its divisors is an integer number (16800180306).

Almost surely, 2^61600661111 is an apocalyptic number.

61600661111 is a deficient number, since it is larger than the sum of its proper divisors (5600060113).

61600661111 is a wasteful number, since it uses less digits than its factorization.

61600661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600060112.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 61600661111 in words is "sixty-one billion, six hundred million, six hundred sixty-one thousand, one hundred eleven".