1565166500 has 24 divisors (see below), whose sum is σ = 3418324728. Its totient is φ = 626066400.

The previous prime is 1565166481. The next prime is 1565166521. The reversal of 1565166500 is 56615651.

It can be written as a sum of positive squares in 4 ways, for example, as 3810304 + 1561356196 = 1952^2 + 39514^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1564667 + ... + 1565666.

It is an arithmetic number, because the mean of its divisors is an integer number (142430197).

Almost surely, 2^1565166500 is an apocalyptic number.

1565166500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1565166500 is an abundant number, since it is smaller than the sum of its proper divisors (1853158228).

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

1565166500 is a wasteful number, since it uses less digits than its factorization.

1565166500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130352 (or 3130340 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1565166500 is about 39562.1852278157. The cubic root of 1565166500 is about 1161.0569290811.

The spelling of 1565166500 in words is "one billion, five hundred sixty-five million, one hundred sixty-six thousand, five hundred".