61111722279 has 4 divisors (see below), whose sum is σ = 81482296376. Its totient is φ = 40741148184.

The previous prime is 61111722271. The next prime is 61111722403. The reversal of 61111722279 is 97222711116.

61111722279 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61111722279 - 2³ = 61111722271 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 (61111722271) 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, 10185287044 + ... + 10185287049.

It is an arithmetic number, because the mean of its divisors is an integer number (20370574094).

Almost surely, 2^61111722279 is an apocalyptic number.

61111722279 is a deficient number, since it is larger than the sum of its proper divisors (20370574097).

61111722279 is a wasteful number, since it uses less digits than its factorization.

61111722279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370574096.

The product of its digits is 21168, while the sum is 39.

The spelling of 61111722279 in words is "sixty-one billion, one hundred eleven million, seven hundred twenty-two thousand, two hundred seventy-nine".