61167787889 has 4 divisors (see below), whose sum is σ = 65873002356. Its totient is φ = 56462573424.

The previous prime is 61167787861. The next prime is 61167787937. The reversal of 61167787889 is 98878776116.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38909535025 + 22258252864 = 197255^2 + 149192^2 .

It is a cyclic number.

It is not a de Polignac number, because 61167787889 - 2⁸ = 61167787633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61167787829) 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, 2352607214 + ... + 2352607239.

It is an arithmetic number, because the mean of its divisors is an integer number (16468250589).

Almost surely, 2^61167787889 is an apocalyptic number.

It is an amenable number.

61167787889 is a deficient number, since it is larger than the sum of its proper divisors (4705214467).

61167787889 is a wasteful number, since it uses less digits than its factorization.

61167787889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705214466.

The product of its digits is 56899584, while the sum is 68.

The spelling of 61167787889 in words is "sixty-one billion, one hundred sixty-seven million, seven hundred eighty-seven thousand, eight hundred eighty-nine".