165478990 has 16 divisors (see below), whose sum is σ = 302058720. Its totient is φ = 65259040.

The previous prime is 165478981. The next prime is 165478991. The reversal of 165478990 is 99874561.

It is a super-2 number, since 2×165478990² = 54766592262840200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165478991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115825 + ... + 117244.

It is an arithmetic number, because the mean of its divisors is an integer number (18878670).

Almost surely, 2^165478990 is an apocalyptic number.

165478990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165478990 is a deficient number, since it is larger than the sum of its proper divisors (136579730).

165478990 is a wasteful number, since it uses less digits than its factorization.

165478990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233147.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 165478990 is about 12863.8637275120. The cubic root of 165478990 is about 549.0108834022.

The spelling of 165478990 in words is "one hundred sixty-five million, four hundred seventy-eight thousand, nine hundred ninety".