1565505730 has 16 divisors (see below), whose sum is σ = 2883443904. Its totient is φ = 611639280.

The previous prime is 1565505701. The next prime is 1565505749. The reversal of 1565505730 is 375055651.

It is a self number, because there is not a number n which added to its sum of digits gives 1565505730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1819926 + ... + 1820785.

It is an arithmetic number, because the mean of its divisors is an integer number (180215244).

Almost surely, 2^1565505730 is an apocalyptic number.

1565505730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1565505730 is a deficient number, since it is larger than the sum of its proper divisors (1317938174).

1565505730 is a wasteful number, since it uses less digits than its factorization.

1565505730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640761.

The product of its (nonzero) digits is 78750, while the sum is 37.

The square root of 1565505730 is about 39566.4722966301. The cubic root of 1565505730 is about 1161.1408044793.

The spelling of 1565505730 in words is "one billion, five hundred sixty-five million, five hundred five thousand, seven hundred thirty".