72005686855 has 4 divisors (see below), whose sum is σ = 86406824232. Its totient is φ = 57604549480.

The previous prime is 72005686817. The next prime is 72005686859. The reversal of 72005686855 is 55868650027.

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

It is not a de Polignac number, because 72005686855 - 2²¹ = 72003589703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72005686859) 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, 7200568681 + ... + 7200568690.

It is an arithmetic number, because the mean of its divisors is an integer number (21601706058).

Almost surely, 2^72005686855 is an apocalyptic number.

72005686855 is a deficient number, since it is larger than the sum of its proper divisors (14401137377).

72005686855 is a wasteful number, since it uses less digits than its factorization.

72005686855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14401137376.

The product of its (nonzero) digits is 4032000, while the sum is 52.

The spelling of 72005686855 in words is "seventy-two billion, five million, six hundred eighty-six thousand, eight hundred fifty-five".