61161100111 has 4 divisors (see below), whose sum is σ = 64380105400. Its totient is φ = 57942094824.

The previous prime is 61161100061. The next prime is 61161100157. The reversal of 61161100111 is 11100116116.

It is a happy number.

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 61161100111 - 2⁷ = 61161099983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 3219005269 = 61161100111 / (6 + 1 + 1 + 6 + 1 + 1 + 0 + 0 + 1 + 1 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61161100411) 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, 1609502616 + ... + 1609502653.

It is an arithmetic number, because the mean of its divisors is an integer number (16095026350).

Almost surely, 2^61161100111 is an apocalyptic number.

61161100111 is a deficient number, since it is larger than the sum of its proper divisors (3219005289).

61161100111 is a wasteful number, since it uses less digits than its factorization.

61161100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3219005288.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 61161100111 its reverse (11100116116), we get a palindrome (72261216227).

The spelling of 61161100111 in words is "sixty-one billion, one hundred sixty-one million, one hundred thousand, one hundred eleven".