72155170022051 has 16 divisors (see below), whose sum is σ = 76481972189280. Its totient is φ = 67837542873600.

The previous prime is 72155170022021. The next prime is 72155170022053. The reversal of 72155170022051 is 15022007155127.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72155170022051 - 2¹⁰ = 72155170021027 is a prime.

It is a super-2 number, since 2×72155170022051² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72155170021996 and 72155170022014.

It is not an unprimeable number, because it can be changed into a prime (72155170022053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107447876 + ... + 108117326.

It is an arithmetic number, because the mean of its divisors is an integer number (4780123261830).

Almost surely, 2^{72155170022051} is an apocalyptic number.

72155170022051 is a deficient number, since it is larger than the sum of its proper divisors (4326802167229).

72155170022051 is a wasteful number, since it uses less digits than its factorization.

72155170022051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676294.

The product of its (nonzero) digits is 49000, while the sum is 38.

Adding to 72155170022051 its reverse (15022007155127), we get a palindrome (87177177177178).

The spelling of 72155170022051 in words is "seventy-two trillion, one hundred fifty-five billion, one hundred seventy million, twenty-two thousand, fifty-one".