165872810 has 8 divisors (see below), whose sum is σ = 298571076. Its totient is φ = 66349120.

The previous prime is 165872807. The next prime is 165872843. The reversal of 165872810 is 18278561.

It can be written as a sum of positive squares in 2 ways, for example, as 151757761 + 14115049 = 12319^2 + 3757^2 .

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

It is a super-2 number, since 2×165872810² = 55027578194592200, which contains 22 as substring.

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, 8293631 + ... + 8293650.

Almost surely, 2^165872810 is an apocalyptic number.

165872810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165872810 is a deficient number, since it is larger than the sum of its proper divisors (132698266).

165872810 is a wasteful number, since it uses less digits than its factorization.

165872810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16587288.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 165872810 is about 12879.1618516113. The cubic root of 165872810 is about 549.4460648784.

The spelling of 165872810 in words is "one hundred sixty-five million, eight hundred seventy-two thousand, eight hundred ten".