75800021173 has 4 divisors (see below), whose sum is σ = 75818745900. Its totient is φ = 75781296448.

The previous prime is 75800021147. The next prime is 75800021183. The reversal of 75800021173 is 37112000857.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13929428529 + 61870592644 = 118023^2 + 248738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75800021173 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 (75800021183) 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, 9356290 + ... + 9364387.

It is an arithmetic number, because the mean of its divisors is an integer number (18954686475).

Almost surely, 2^75800021173 is an apocalyptic number.

It is an amenable number.

75800021173 is a deficient number, since it is larger than the sum of its proper divisors (18724727).

75800021173 is a wasteful number, since it uses less digits than its factorization.

75800021173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18724726.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 75800021173 in words is "seventy-five billion, eight hundred million, twenty-one thousand, one hundred seventy-three".