72355736605 has 4 divisors (see below), whose sum is σ = 86826883932. Its totient is φ = 57884589280.

The previous prime is 72355736599. The next prime is 72355736641. The reversal of 72355736605 is 50663755327.

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 48571311321 + 23784425284 = 220389^2 + 154222^2 .

It is not a de Polignac number, because 72355736605 - 2¹¹ = 72355734557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7235573656 + ... + 7235573665.

It is an arithmetic number, because the mean of its divisors is an integer number (21706720983).

Almost surely, 2^72355736605 is an apocalyptic number.

It is an amenable number.

72355736605 is a deficient number, since it is larger than the sum of its proper divisors (14471147327).

72355736605 is a wasteful number, since it uses less digits than its factorization.

72355736605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14471147326.

The product of its (nonzero) digits is 3969000, while the sum is 49.

The spelling of 72355736605 in words is "seventy-two billion, three hundred fifty-five million, seven hundred thirty-six thousand, six hundred five".