72155217162169 has 8 divisors (see below), whose sum is σ = 72445063531680. Its totient is φ = 71865938563776.

The previous prime is 72155217162109. The next prime is 72155217162173. The reversal of 72155217162169 is 96126171255127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72155217162169 is a prime.

It is a super-2 number, since 2×72155217162169² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72155217162109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141688099 + ... + 142196440.

It is an arithmetic number, because the mean of its divisors is an integer number (9055632941460).

Almost surely, 2^{72155217162169} is an apocalyptic number.

It is an amenable number.

72155217162169 is a deficient number, since it is larger than the sum of its proper divisors (289846369511).

72155217162169 is a wasteful number, since it uses less digits than its factorization.

72155217162169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283885559.

The product of its digits is 3175200, while the sum is 55.

The spelling of 72155217162169 in words is "seventy-two trillion, one hundred fifty-five billion, two hundred seventeen million, one hundred sixty-two thousand, one hundred sixty-nine".