172227470551 has 4 divisors (see below), whose sum is σ = 172236445504. Its totient is φ = 172218495600.

The previous prime is 172227470531. The next prime is 172227470557. The reversal of 172227470551 is 155074722271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155074722271 = 7 ⋅22153531753.

It is a cyclic number.

It is not a de Polignac number, because 172227470551 - 2⁷ = 172227470423 is a prime.

It is a super-2 number, since 2×172227470551² (a number of 23 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 = 172227470498 and 172227470507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172227470557) 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, 4458630 + ... + 4497091.

It is an arithmetic number, because the mean of its divisors is an integer number (43059111376).

Almost surely, 2^172227470551 is an apocalyptic number.

172227470551 is a deficient number, since it is larger than the sum of its proper divisors (8974953).

172227470551 is an equidigital number, since it uses as much as digits as its factorization.

172227470551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8974952.

The product of its (nonzero) digits is 274400, while the sum is 43.

The spelling of 172227470551 in words is "one hundred seventy-two billion, two hundred twenty-seven million, four hundred seventy thousand, five hundred fifty-one".