75849016621 has 4 divisors (see below), whose sum is σ = 86684590432. Its totient is φ = 65013442812.

The previous prime is 75849016591. The next prime is 75849016669. The reversal of 75849016621 is 12661094857.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12661094857 = 1129 ⋅11214433.

It is a cyclic number.

It is not a de Polignac number, because 75849016621 - 2¹³ = 75849008429 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 (75849016121) 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 3 ways as a sum of consecutive naturals, for example, 5417786895 + ... + 5417786908.

It is an arithmetic number, because the mean of its divisors is an integer number (21671147608).

Almost surely, 2^75849016621 is an apocalyptic number.

It is an amenable number.

75849016621 is a deficient number, since it is larger than the sum of its proper divisors (10835573811).

75849016621 is a wasteful number, since it uses less digits than its factorization.

75849016621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10835573810.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 75849016621 in words is "seventy-five billion, eight hundred forty-nine million, sixteen thousand, six hundred twenty-one".