75356194661021 has 4 divisors (see below), whose sum is σ = 75366256919100. Its totient is φ = 75346132402944.

The previous prime is 75356194661003. The next prime is 75356194661039. The reversal of 75356194661021 is 12016649165357.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (75356194661003) and next prime (75356194661039).

It can be written as a sum of positive squares in 2 ways, for example, as 46703405652121 + 28652789008900 = 6833989^2 + 5352830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75356194661021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75356194661081) 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, 5031117806 + ... + 5031132783.

It is an arithmetic number, because the mean of its divisors is an integer number (18841564229775).

Almost surely, 2^{75356194661021} is an apocalyptic number.

It is an amenable number.

75356194661021 is a deficient number, since it is larger than the sum of its proper divisors (10062258079).

75356194661021 is a wasteful number, since it uses less digits than its factorization.

75356194661021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10062258078.

The product of its (nonzero) digits is 8164800, while the sum is 56.

The spelling of 75356194661021 in words is "seventy-five trillion, three hundred fifty-six billion, one hundred ninety-four million, six hundred sixty-one thousand, twenty-one".