75451748729 has 4 divisors (see below), whose sum is σ = 86230569984. Its totient is φ = 64672927476.

The previous prime is 75451748651. The next prime is 75451748767. The reversal of 75451748729 is 92784715457.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92784715457 = 7 ⋅13254959351.

It is a cyclic number.

It is not a de Polignac number, because 75451748729 - 2³⁶ = 6732271993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75451747729) 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, 5389410617 + ... + 5389410630.

It is an arithmetic number, because the mean of its divisors is an integer number (21557642496).

Almost surely, 2^75451748729 is an apocalyptic number.

It is an amenable number.

75451748729 is a deficient number, since it is larger than the sum of its proper divisors (10778821255).

75451748729 is a wasteful number, since it uses less digits than its factorization.

75451748729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10778821254.

The product of its digits is 19756800, while the sum is 59.

The spelling of 75451748729 in words is "seventy-five billion, four hundred fifty-one million, seven hundred forty-eight thousand, seven hundred twenty-nine".