172068561 has 24 divisors (see below), whose sum is σ = 284753664. Its totient is φ = 98081280.

The previous prime is 172068553. The next prime is 172068587. The reversal of 172068561 is 165860271.

172068561 is a `hidden beast` number, since 17 + 20 + 68 + 561 = 666.

It is not a de Polignac number, because 172068561 - 2³ = 172068553 is a prime.

It is a super-2 number, since 2×172068561² = 59215179369221442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172068511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23985 + ... + 30321.

It is an arithmetic number, because the mean of its divisors is an integer number (11864736).

Almost surely, 2^172068561 is an apocalyptic number.

It is an amenable number.

172068561 is a deficient number, since it is larger than the sum of its proper divisors (112685103).

172068561 is a wasteful number, since it uses less digits than its factorization.

172068561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781 (or 6778 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 172068561 is about 13117.4906517977. The cubic root of 172068561 is about 556.2036598858.

The spelling of 172068561 in words is "one hundred seventy-two million, sixty-eight thousand, five hundred sixty-one".