172674322681 has 81 divisors (see below), whose sum is σ = 219940330701. Its totient is φ = 135153879168.

The previous prime is 172674322679. The next prime is 172674322697. The reversal of 172674322681 is 186223476271.

The square root of 172674322681 is 415541.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 15810799081 + 156863523600 = 125741^2 + 396060^2 .

It is not a de Polignac number, because 172674322681 - 2¹ = 172674322679 is a prime.

It is a super-2 number, since 2×172674322681² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (172674322651) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1940160885 + ... + 1940160973.

Almost surely, 2^172674322681 is an apocalyptic number.

172674322681 is the 415541-st square number.

172674322681 is the 207771-st centered octagonal number.

It is an amenable number.

172674322681 is a deficient number, since it is larger than the sum of its proper divisors (47266008020).

172674322681 is an frugal number, since it uses more digits than its factorization.

172674322681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 148 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 49.

Multiplying 172674322681 by its sum of digits (49), we get a square (8461041811369 = 2908787²).

172674322681 divided by its sum of digits (49) gives a square (3523965769 = 59363²).

The spelling of 172674322681 in words is "one hundred seventy-two billion, six hundred seventy-four million, three hundred twenty-two thousand, six hundred eighty-one".