61184395491 has 8 divisors (see below), whose sum is σ = 81778655760. Its totient is φ = 40689866112.

The previous prime is 61184395457. The next prime is 61184395543. The reversal of 61184395491 is 19459348116.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-61184395491 is a prime.

It is a super-2 number, since 2×61184395491² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61184395421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24931290 + ... + 24933743.

It is an arithmetic number, because the mean of its divisors is an integer number (10222331970).

Almost surely, 2^61184395491 is an apocalyptic number.

61184395491 is a deficient number, since it is larger than the sum of its proper divisors (20594260269).

61184395491 is a wasteful number, since it uses less digits than its factorization.

61184395491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49865445.

The product of its digits is 933120, while the sum is 51.

The spelling of 61184395491 in words is "sixty-one billion, one hundred eighty-four million, three hundred ninety-five thousand, four hundred ninety-one".