561166722279 has 32 divisors (see below), whose sum is σ = 834757560000. Its totient is φ = 372584022912.

The previous prime is 561166722269. The next prime is 561166722287. The reversal of 561166722279 is 972227661165.

It is a happy number.

561166722279 is a `hidden beast` number, since 561 + 1 + 6 + 6 + 7 + 2 + 2 + 2 + 79 = 666.

It is not a de Polignac number, because 561166722279 - 2²⁰ = 561165673703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561166722209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7775749 + ... + 7847585.

It is an arithmetic number, because the mean of its divisors is an integer number (26086173750).

Almost surely, 2^561166722279 is an apocalyptic number.

561166722279 is a deficient number, since it is larger than the sum of its proper divisors (273590837721).

561166722279 is a wasteful number, since it uses less digits than its factorization.

561166722279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73024 (or 73018 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The spelling of 561166722279 in words is "five hundred sixty-one billion, one hundred sixty-six million, seven hundred twenty-two thousand, two hundred seventy-nine".