172556331643 has 16 divisors (see below), whose sum is σ = 179599904640. Its totient is φ = 165646204416.

The previous prime is 172556331589. The next prime is 172556331709. The reversal of 172556331643 is 346133655271.

It is a cyclic number.

It is not a de Polignac number, because 172556331643 - 2¹³ = 172556323451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172556331593 and 172556331602.

It is not an unprimeable number, because it can be changed into a prime (172556331443) 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, 1468071 + ... + 1581247.

It is an arithmetic number, because the mean of its divisors is an integer number (11224994040).

Almost surely, 2^172556331643 is an apocalyptic number.

172556331643 is a deficient number, since it is larger than the sum of its proper divisors (7043572997).

172556331643 is a wasteful number, since it uses less digits than its factorization.

172556331643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113766.

The product of its digits is 1360800, while the sum is 46.

The spelling of 172556331643 in words is "one hundred seventy-two billion, five hundred fifty-six million, three hundred thirty-one thousand, six hundred forty-three".