5661495391 has 8 divisors (see below), whose sum is σ = 5955987600. Its totient is φ = 5373621120.

The previous prime is 5661495353. The next prime is 5661495409. The reversal of 5661495391 is 1935941665.

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

It is not a de Polignac number, because 5661495391 - 2⁹ = 5661494879 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 (5661495491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652730 + ... + 1656151.

It is an arithmetic number, because the mean of its divisors is an integer number (744498450).

Almost surely, 2^5661495391 is an apocalyptic number.

5661495391 is a deficient number, since it is larger than the sum of its proper divisors (294492209).

5661495391 is a wasteful number, since it uses less digits than its factorization.

5661495391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308969.

The product of its digits is 874800, while the sum is 49.

The square root of 5661495391 is about 75242.9092406720. The cubic root of 5661495391 is about 1782.2845924000.

The spelling of 5661495391 in words is "five billion, six hundred sixty-one million, four hundred ninety-five thousand, three hundred ninety-one".