172781462161 has 24 divisors (see below), whose sum is σ = 221274218880. Its totient is φ = 133399677600.

The previous prime is 172781462159. The next prime is 172781462167. The reversal of 172781462161 is 161264187271.

It is a happy number.

It is not a de Polignac number, because 172781462161 - 2¹ = 172781462159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172781462167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1411705 + ... + 1529206.

It is an arithmetic number, because the mean of its divisors is an integer number (9219759120).

Almost surely, 2^172781462161 is an apocalyptic number.

172781462161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172781462161 is a deficient number, since it is larger than the sum of its proper divisors (48492756719).

172781462161 is a wasteful number, since it uses less digits than its factorization.

172781462161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941045 (or 2941038 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The spelling of 172781462161 in words is "one hundred seventy-two billion, seven hundred eighty-one million, four hundred sixty-two thousand, one hundred sixty-one".