72208805911785 has 128 divisors (see below), whose sum is σ = 135073651507200. Its totient is φ = 36555119493120.

The previous prime is 72208805911783. The next prime is 72208805911793. The reversal of 72208805911785 is 58711950880227.

72208805911785 is a `hidden beast` number, since 7 + 2 + 20 + 8 + 8 + 0 + 591 + 17 + 8 + 5 = 666.

72208805911785 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 72208805911785 - 2¹ = 72208805911783 is a prime.

It is a super-2 number, since 2×72208805911785² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72208805911783) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47534569 + ... + 49030121.

It is an arithmetic number, because the mean of its divisors is an integer number (1055262902400).

Almost surely, 2^{72208805911785} is an apocalyptic number.

It is an amenable number.

72208805911785 is a deficient number, since it is larger than the sum of its proper divisors (62864845595415).

72208805911785 is a wasteful number, since it uses less digits than its factorization.

72208805911785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495820 (or 1495814 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 63.

The spelling of 72208805911785 in words is "seventy-two trillion, two hundred eight billion, eight hundred five million, nine hundred eleven thousand, seven hundred eighty-five".