172243607661261 has 16 divisors (see below), whose sum is σ = 255216110385600. Its totient is φ = 114810893874864.

The previous prime is 172243607661259. The next prime is 172243607661343. The reversal of 172243607661261 is 162166706342271.

172243607661261 is a `hidden beast` number, since 1 + 7 + 2 + 2 + 4 + 3 + 607 + 6 + 6 + 1 + 26 + 1 = 666.

It is not a de Polignac number, because 172243607661261 - 2¹ = 172243607661259 is a prime.

It is a super-2 number, since 2×172243607661261² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172243607661198 and 172243607661207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172243607561261) 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, 504767931 + ... + 505109048.

It is an arithmetic number, because the mean of its divisors is an integer number (15951006899100).

Almost surely, 2^{172243607661261} is an apocalyptic number.

It is an amenable number.

172243607661261 is a deficient number, since it is larger than the sum of its proper divisors (82972502724339).

172243607661261 is a wasteful number, since it uses less digits than its factorization.

172243607661261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009883305 (or 1009883299 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 172243607661261 in words is "one hundred seventy-two trillion, two hundred forty-three billion, six hundred seven million, six hundred sixty-one thousand, two hundred sixty-one".