75421023217 has 2 divisors, whose sum is σ = 75421023218. Its totient is φ = 75421023216.

The previous prime is 75421023149. The next prime is 75421023233. The reversal of 75421023217 is 71232012457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39305441536 + 36115581681 = 198256^2 + 190041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75421023217 is a prime.

It is not a weakly prime, because it can be changed into another prime (75421023257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37710511608 + 37710511609.

It is an arithmetic number, because the mean of its divisors is an integer number (37710511609).

Almost surely, 2^75421023217 is an apocalyptic number.

It is an amenable number.

75421023217 is a deficient number, since it is larger than the sum of its proper divisors (1).

75421023217 is an equidigital number, since it uses as much as digits as its factorization.

75421023217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 75421023217 in words is "seventy-five billion, four hundred twenty-one million, twenty-three thousand, two hundred seventeen".