75420815409 has 24 divisors (see below), whose sum is σ = 112334040000. Its totient is φ = 48737468832.

The previous prime is 75420815357. The next prime is 75420815423. The reversal of 75420815409 is 90451802457.

75420815409 is a `hidden beast` number, since 7 + 5 + 4 + 20 + 81 + 540 + 9 = 666.

It is not a de Polignac number, because 75420815409 - 2²³ = 75412426801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75420815489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 912909 + ... + 992090.

It is an arithmetic number, because the mean of its divisors is an integer number (4680585000).

Almost surely, 2^75420815409 is an apocalyptic number.

It is an amenable number.

75420815409 is a deficient number, since it is larger than the sum of its proper divisors (36913224591).

75420815409 is a wasteful number, since it uses less digits than its factorization.

75420815409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905141 (or 1905138 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 75420815409 in words is "seventy-five billion, four hundred twenty million, eight hundred fifteen thousand, four hundred nine".