172816220728095 has 32 divisors (see below), whose sum is σ = 316080758756352. Its totient is φ = 78983212119552.

The previous prime is 172816220728051. The next prime is 172816220728117. The reversal of 172816220728095 is 590827022618271.

It is a happy number.

It is not a de Polignac number, because 172816220728095 - 2⁷ = 172816220727967 is a prime.

It is a super-2 number, since 2×172816220728095² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192140707 + ... + 193038036.

It is an arithmetic number, because the mean of its divisors is an integer number (9877523711136).

Almost surely, 2^{172816220728095} is an apocalyptic number.

172816220728095 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172816220728095 is a deficient number, since it is larger than the sum of its proper divisors (143264538028257).

172816220728095 is a wasteful number, since it uses less digits than its factorization.

172816220728095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385183031.

The product of its (nonzero) digits is 13547520, while the sum is 60.

The spelling of 172816220728095 in words is "one hundred seventy-two trillion, eight hundred sixteen billion, two hundred twenty million, seven hundred twenty-eight thousand, ninety-five".