172290818642 has 8 divisors (see below), whose sum is σ = 259033079676. Its totient is φ = 85946458752.

The previous prime is 172290818617. The next prime is 172290818671. The reversal of 172290818642 is 246818092271.

It can be written as a sum of positive squares in 2 ways, for example, as 162232533961 + 10058284681 = 402781^2 + 100291^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99474203 + ... + 99475934.

Almost surely, 2^172290818642 is an apocalyptic number.

172290818642 is a deficient number, since it is larger than the sum of its proper divisors (86742261034).

172290818642 is a wasteful number, since it uses less digits than its factorization.

172290818642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198950572.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 172290818642 in words is "one hundred seventy-two billion, two hundred ninety million, eight hundred eighteen thousand, six hundred forty-two".