75434620742321 has 4 divisors (see below), whose sum is σ = 75435376480500. Its totient is φ = 75433865004144.

The previous prime is 75434620742281. The next prime is 75434620742357. The reversal of 75434620742321 is 12324702643457.

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 37178725774096 + 38255894968225 = 6097436^2 + 6185135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75434620742321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75434620742321.

It is not an unprimeable number, because it can be changed into a prime (75434620742381) 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, 377719346 + ... + 377919003.

It is an arithmetic number, because the mean of its divisors is an integer number (18858844120125).

Almost surely, 2^{75434620742321} is an apocalyptic number.

It is an amenable number.

75434620742321 is a deficient number, since it is larger than the sum of its proper divisors (755738179).

75434620742321 is an equidigital number, since it uses as much as digits as its factorization.

75434620742321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755738178.

The product of its (nonzero) digits is 6773760, while the sum is 50.

The spelling of 75434620742321 in words is "seventy-five trillion, four hundred thirty-four billion, six hundred twenty million, seven hundred forty-two thousand, three hundred twenty-one".