172641577103561 has 8 divisors (see below), whose sum is σ = 175937855483520. Its totient is φ = 169346739098992.

The previous prime is 172641577103549. The next prime is 172641577103587. The reversal of 172641577103561 is 165301775146271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172641577103561 - 2¹⁸ = 172641576841417 is a prime.

It is a super-2 number, since 2×172641577103561² (a number of 29 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 = 172641577103497 and 172641577103506.

It is not an unprimeable number, because it can be changed into a prime (172641577103521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359851841 + ... + 360331278.

It is an arithmetic number, because the mean of its divisors is an integer number (21992231935440).

Almost surely, 2^{172641577103561} is an apocalyptic number.

It is an amenable number.

172641577103561 is a deficient number, since it is larger than the sum of its proper divisors (3296278379959).

172641577103561 is an equidigital number, since it uses as much as digits as its factorization.

172641577103561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720187695.

The product of its (nonzero) digits is 7408800, while the sum is 56.

The spelling of 172641577103561 in words is "one hundred seventy-two trillion, six hundred forty-one billion, five hundred seventy-seven million, one hundred three thousand, five hundred sixty-one".