72805510097 has 4 divisors (see below), whose sum is σ = 73336937316. Its totient is φ = 72274082880.

The previous prime is 72805510087. The next prime is 72805510117. The reversal of 72805510097 is 79001550827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31986964801 + 40818545296 = 178849^2 + 202036^2 .

It is a cyclic number.

It is not a de Polignac number, because 72805510097 - 2¹² = 72805506001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72805510087) 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, 265713404 + ... + 265713677.

It is an arithmetic number, because the mean of its divisors is an integer number (18334234329).

Almost surely, 2^72805510097 is an apocalyptic number.

It is an amenable number.

72805510097 is a deficient number, since it is larger than the sum of its proper divisors (531427219).

72805510097 is a wasteful number, since it uses less digits than its factorization.

72805510097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531427218.

The product of its (nonzero) digits is 176400, while the sum is 44.

The spelling of 72805510097 in words is "seventy-two billion, eight hundred five million, five hundred ten thousand, ninety-seven".