172861541563 has 4 divisors (see below), whose sum is σ = 172863138448. Its totient is φ = 172859944680.

The previous prime is 172861541561. The next prime is 172861541581. The reversal of 172861541563 is 365145168271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172861541563 - 2¹ = 172861541561 is a prime.

It is a super-2 number, since 2×172861541563² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172861541561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623256 + ... + 856837.

It is an arithmetic number, because the mean of its divisors is an integer number (43215784612).

Almost surely, 2^172861541563 is an apocalyptic number.

172861541563 is a deficient number, since it is larger than the sum of its proper divisors (1596885).

172861541563 is a wasteful number, since it uses less digits than its factorization.

172861541563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596884.

The product of its digits is 1209600, while the sum is 49.

The spelling of 172861541563 in words is "one hundred seventy-two billion, eight hundred sixty-one million, five hundred forty-one thousand, five hundred sixty-three".