75439661391 has 16 divisors (see below), whose sum is σ = 112847537920. Its totient is φ = 49804823160.

The previous prime is 75439661383. The next prime is 75439661393. The reversal of 75439661391 is 19316693457.

75439661391 is a `hidden beast` number, since 7 + 543 + 9 + 6 + 6 + 1 + 3 + 91 = 666.

It is not a de Polignac number, because 75439661391 - 2³ = 75439661383 is a prime.

It is a super-2 number, since 2×75439661391² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75439661393) 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 15 ways as a sum of consecutive naturals, for example, 13560625 + ... + 13566186.

It is an arithmetic number, because the mean of its divisors is an integer number (7052971120).

Almost surely, 2^75439661391 is an apocalyptic number.

75439661391 is a deficient number, since it is larger than the sum of its proper divisors (37407876529).

75439661391 is a wasteful number, since it uses less digits than its factorization.

75439661391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27126923 (or 27126917 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The spelling of 75439661391 in words is "seventy-five billion, four hundred thirty-nine million, six hundred sixty-one thousand, three hundred ninety-one".