172918661019 has 16 divisors (see below), whose sum is σ = 259088831232. Its totient is φ = 101784896928.

The previous prime is 172918660949. The next prime is 172918661023. The reversal of 172918661019 is 910166819271.

It is not a de Polignac number, because 172918661019 - 2⁷ = 172918660891 is a prime.

It is a super-2 number, since 2×172918661019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172918663019) 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, 96386317 + ... + 96388110.

It is an arithmetic number, because the mean of its divisors is an integer number (16193051952).

Almost surely, 2^172918661019 is an apocalyptic number.

172918661019 is a deficient number, since it is larger than the sum of its proper divisors (86170170213).

172918661019 is a wasteful number, since it uses less digits than its factorization.

172918661019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192774466.

The product of its (nonzero) digits is 326592, while the sum is 51.

The spelling of 172918661019 in words is "one hundred seventy-two billion, nine hundred eighteen million, six hundred sixty-one thousand, nineteen".