61117171111 has 4 divisors (see below), whose sum is σ = 63224659800. Its totient is φ = 59009682424.

The previous prime is 61117171109. The next prime is 61117171133. The reversal of 61117171111 is 11117171116.

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 61117171111 - 2¹ = 61117171109 is a prime.

It is a super-2 number, since 2×61117171111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61117171111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61117171211) 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, 1053744301 + ... + 1053744358.

It is an arithmetic number, because the mean of its divisors is an integer number (15806164950).

Almost surely, 2^61117171111 is an apocalyptic number.

61117171111 is a deficient number, since it is larger than the sum of its proper divisors (2107488689).

61117171111 is a wasteful number, since it uses less digits than its factorization.

61117171111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107488688.

The product of its digits is 294, while the sum is 28.

The spelling of 61117171111 in words is "sixty-one billion, one hundred seventeen million, one hundred seventy-one thousand, one hundred eleven".