75479040209 has 2 divisors, whose sum is σ = 75479040210. Its totient is φ = 75479040208.

The previous prime is 75479040199. The next prime is 75479040239. The reversal of 75479040209 is 90204097457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70564609600 + 4914430609 = 265640^2 + 70103^2 .

It is a cyclic number.

It is not a de Polignac number, because 75479040209 - 2⁴ = 75479040193 is a prime.

It is not a weakly prime, because it can be changed into another prime (75479040239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37739520104 + 37739520105.

It is an arithmetic number, because the mean of its divisors is an integer number (37739520105).

Almost surely, 2^75479040209 is an apocalyptic number.

It is an amenable number.

75479040209 is a deficient number, since it is larger than the sum of its proper divisors (1).

75479040209 is an equidigital number, since it uses as much as digits as its factorization.

75479040209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 75479040209 in words is "seventy-five billion, four hundred seventy-nine million, forty thousand, two hundred nine".