75505144391 has 4 divisors (see below), whose sum is σ = 75639257112. Its totient is φ = 75371031672.

The previous prime is 75505144369. The next prime is 75505144397. The reversal of 75505144391 is 19344150557.

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

It is a cyclic number.

It is not a de Polignac number, because 75505144391 - 2¹⁴ = 75505128007 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 (75505144397) 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, 67055516 + ... + 67056641.

It is an arithmetic number, because the mean of its divisors is an integer number (18909814278).

Almost surely, 2^75505144391 is an apocalyptic number.

75505144391 is a deficient number, since it is larger than the sum of its proper divisors (134112721).

75505144391 is a wasteful number, since it uses less digits than its factorization.

75505144391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134112720.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 75505144391 in words is "seventy-five billion, five hundred five million, one hundred forty-four thousand, three hundred ninety-one".