165421630 has 64 divisors (see below), whose sum is σ = 335067840. Its totient is φ = 58291200.

The previous prime is 165421621. The next prime is 165421687. The reversal of 165421630 is 36124561.

165421630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 597052 + ... + 597328.

It is an arithmetic number, because the mean of its divisors is an integer number (5235435).

Almost surely, 2^165421630 is an apocalyptic number.

165421630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165421630 is an abundant number, since it is smaller than the sum of its proper divisors (169646210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165421630 is a wasteful number, since it uses less digits than its factorization.

165421630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 165421630 is about 12861.6340330457. The cubic root of 165421630 is about 548.9474415043.

The spelling of 165421630 in words is "one hundred sixty-five million, four hundred twenty-one thousand, six hundred thirty".