1665573130 has 64 divisors (see below), whose sum is σ = 3511136160. Its totient is φ = 563134464.

The previous prime is 1665573121. The next prime is 1665573157. The reversal of 1665573130 is 313755661.

It can be written as a sum of positive squares in 16 ways, for example, as 547138881 + 1118434249 = 23391^2 + 33443^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 1665573130.

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, 71586 + ... + 91954.

Almost surely, 2^1665573130 is an apocalyptic number.

1665573130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665573130 is an abundant number, since it is smaller than the sum of its proper divisors (1845563030).

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

1665573130 is a wasteful number, since it uses less digits than its factorization.

1665573130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20443.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 1665573130 is about 40811.4338145574. The cubic root of 1665573130 is about 1185.3717385473.

The spelling of 1665573130 in words is "one billion, six hundred sixty-five million, five hundred seventy-three thousand, one hundred thirty".