165673980 has 36 divisors (see below), whose sum is σ = 502544952. Its totient is φ = 44179680.

The previous prime is 165673979. The next prime is 165673999. The reversal of 165673980 is 89376561.

It is a happy number.

165673980 is a `hidden beast` number, since 1 + 6 + 567 + 3 + 9 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460026 + ... + 460385.

It is an arithmetic number, because the mean of its divisors is an integer number (13959582).

Almost surely, 2^165673980 is an apocalyptic number.

165673980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165673980 is an abundant number, since it is smaller than the sum of its proper divisors (336870972).

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

165673980 is a wasteful number, since it uses less digits than its factorization.

165673980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920426 (or 920421 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 165673980 is about 12871.4404788275. The cubic root of 165673980 is about 549.2264386861.

The spelling of 165673980 in words is "one hundred sixty-five million, six hundred seventy-three thousand, nine hundred eighty".