75138541243 has 4 divisors (see below), whose sum is σ = 75201525288. Its totient is φ = 75075557200.

The previous prime is 75138541229. The next prime is 75138541327. The reversal of 75138541243 is 34214583157.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34214583157 = 103 ⋅332180419.

It is a cyclic number.

It is not a de Polignac number, because 75138541243 - 2⁵ = 75138541211 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 75138541243.

It is not an unprimeable number, because it can be changed into a prime (75138571243) 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, 31490233 + ... + 31492618.

It is an arithmetic number, because the mean of its divisors is an integer number (18800381322).

Almost surely, 2^75138541243 is an apocalyptic number.

75138541243 is a deficient number, since it is larger than the sum of its proper divisors (62984045).

75138541243 is a wasteful number, since it uses less digits than its factorization.

75138541243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62984044.

The product of its digits is 403200, while the sum is 43.

The spelling of 75138541243 in words is "seventy-five billion, one hundred thirty-eight million, five hundred forty-one thousand, two hundred forty-three".