72170122807 has 4 divisors (see below), whose sum is σ = 73848497800. Its totient is φ = 70491747816.

The previous prime is 72170122793. The next prime is 72170122837. The reversal of 72170122807 is 70822107127.

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

It is a cyclic number.

It is not a de Polignac number, because 72170122807 - 2¹⁹ = 72169598519 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 (72170122837) 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, 839187432 + ... + 839187517.

It is an arithmetic number, because the mean of its divisors is an integer number (18462124450).

Almost surely, 2^72170122807 is an apocalyptic number.

72170122807 is a deficient number, since it is larger than the sum of its proper divisors (1678374993).

72170122807 is a wasteful number, since it uses less digits than its factorization.

72170122807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678374992.

The product of its (nonzero) digits is 21952, while the sum is 37.

The spelling of 72170122807 in words is "seventy-two billion, one hundred seventy million, one hundred twenty-two thousand, eight hundred seven".