75051821749 has 4 divisors (see below), whose sum is σ = 75055506336. Its totient is φ = 75048137164.

The previous prime is 75051821743. The next prime is 75051821783. The reversal of 75051821749 is 94712815057.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75051821749 - 2¹¹ = 75051819701 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 (75051821743) 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 3 ways as a sum of consecutive naturals, for example, 1811569 + ... + 1852534.

It is an arithmetic number, because the mean of its divisors is an integer number (18763876584).

Almost surely, 2^75051821749 is an apocalyptic number.

It is an amenable number.

75051821749 is a deficient number, since it is larger than the sum of its proper divisors (3684587).

75051821749 is a wasteful number, since it uses less digits than its factorization.

75051821749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684586.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 75051821749 in words is "seventy-five billion, fifty-one million, eight hundred twenty-one thousand, seven hundred forty-nine".