61191345089 has 8 divisors (see below), whose sum is σ = 71360169600. Its totient is φ = 52449724068.

The previous prime is 61191345077. The next prime is 61191345097. The reversal of 61191345089 is 98054319116.

It is not a de Polignac number, because 61191345089 - 2²⁴ = 61174567873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61191345029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89199869 + ... + 89200554.

It is an arithmetic number, because the mean of its divisors is an integer number (8920021200).

Almost surely, 2^61191345089 is an apocalyptic number.

It is an amenable number.

61191345089 is a deficient number, since it is larger than the sum of its proper divisors (10168824511).

61191345089 is an equidigital number, since it uses as much as digits as its factorization.

61191345089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178400444 (or 178400430 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 61191345089 in words is "sixty-one billion, one hundred ninety-one million, three hundred forty-five thousand, eighty-nine".