73519928257 has 4 divisors (see below), whose sum is σ = 73679407956. Its totient is φ = 73360448560.

The previous prime is 73519928249. The next prime is 73519928281. The reversal of 73519928257 is 75282991537.

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: 75282991537 = 13 ⋅5790999349.

It can be written as a sum of positive squares in 2 ways, for example, as 10064303041 + 63455625216 = 100321^2 + 251904^2 .

It is a cyclic number.

It is not a de Polignac number, because 73519928257 - 2³ = 73519928249 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73519928227) 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, 79739158 + ... + 79740079.

It is an arithmetic number, because the mean of its divisors is an integer number (18419851989).

Almost surely, 2^73519928257 is an apocalyptic number.

It is an amenable number.

73519928257 is a deficient number, since it is larger than the sum of its proper divisors (159479699).

73519928257 is a wasteful number, since it uses less digits than its factorization.

73519928257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159479698.

The product of its digits is 9525600, while the sum is 58.

The spelling of 73519928257 in words is "seventy-three billion, five hundred nineteen million, nine hundred twenty-eight thousand, two hundred fifty-seven".