842172665 has 8 divisors (see below), whose sum is σ = 1014837120. Its totient is φ = 670918192.

The previous prime is 842172659. The next prime is 842172679. The reversal of 842172665 is 566271248.

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 842172665 - 2¹⁸ = 841910521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351179 + ... + 353568.

It is an arithmetic number, because the mean of its divisors is an integer number (126854640).

Almost surely, 2^842172665 is an apocalyptic number.

It is an amenable number.

842172665 is a deficient number, since it is larger than the sum of its proper divisors (172664455).

842172665 is a wasteful number, since it uses less digits than its factorization.

842172665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704991.

The product of its digits is 161280, while the sum is 41.

The square root of 842172665 is about 29020.2113190101. The cubic root of 842172665 is about 944.3515852750.

The spelling of 842172665 in words is "eight hundred forty-two million, one hundred seventy-two thousand, six hundred sixty-five".