75518464121 has 4 divisors (see below), whose sum is σ = 75523467600. Its totient is φ = 75513460644.

The previous prime is 75518464061. The next prime is 75518464123. The reversal of 75518464121 is 12146481557.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75518464121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75518464123) 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, 2479031 + ... + 2509308.

It is an arithmetic number, because the mean of its divisors is an integer number (18880866900).

Almost surely, 2^75518464121 is an apocalyptic number.

It is an amenable number.

75518464121 is a deficient number, since it is larger than the sum of its proper divisors (5003479).

75518464121 is a wasteful number, since it uses less digits than its factorization.

75518464121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003478.

The product of its digits is 268800, while the sum is 44.

The spelling of 75518464121 in words is "seventy-five billion, five hundred eighteen million, four hundred sixty-four thousand, one hundred twenty-one".