75243434257 has 4 divisors (see below), whose sum is σ = 75244068900. Its totient is φ = 75242799616.

The previous prime is 75243434207. The next prime is 75243434263.

75243434257 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47766725136 + 27476709121 = 218556^2 + 165761^2 .

It is a cyclic number.

It is not a de Polignac number, because 75243434257 - 2¹⁵ = 75243401489 is a prime.

It is a super-2 number, since 2×75243434257² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75243434207) 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, 80632 + ... + 396217.

It is an arithmetic number, because the mean of its divisors is an integer number (18811017225).

Almost surely, 2^75243434257 is an apocalyptic number.

It is an amenable number.

75243434257 is a deficient number, since it is larger than the sum of its proper divisors (634643).

75243434257 is a wasteful number, since it uses less digits than its factorization.

75243434257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634642.

The product of its digits is 2822400, while the sum is 46.

The spelling of 75243434257 in words is "seventy-five billion, two hundred forty-three million, four hundred thirty-four thousand, two hundred fifty-seven".