73515665251 has 6 divisors (see below), whose sum is σ = 85518222900. Its totient is φ = 63013427316.

The previous prime is 73515665207. The next prime is 73515665257. The reversal of 73515665251 is 15256651537.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-73515665251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73515665257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 750159801 + ... + 750159898.

It is an arithmetic number, because the mean of its divisors is an integer number (14253037150).

Almost surely, 2^73515665251 is an apocalyptic number.

73515665251 is a deficient number, since it is larger than the sum of its proper divisors (12002557649).

73515665251 is a wasteful number, since it uses less digits than its factorization.

73515665251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500319713 (or 1500319706 counting only the distinct ones).

The product of its digits is 945000, while the sum is 46.

The spelling of 73515665251 in words is "seventy-three billion, five hundred fifteen million, six hundred sixty-five thousand, two hundred fifty-one".