1565135020 has 24 divisors (see below), whose sum is σ = 3289535424. Its totient is φ = 625529856.

The previous prime is 1565134951. The next prime is 1565135023. The reversal of 1565135020 is 205315651.

It is a self number, because there is not a number n which added to its sum of digits gives 1565135020.

It is not an unprimeable number, because it can be changed into a prime (1565135023) 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, 7812 + ... + 56491.

It is an arithmetic number, because the mean of its divisors is an integer number (137063976).

Almost surely, 2^1565135020 is an apocalyptic number.

1565135020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1565135020 is an abundant number, since it is smaller than the sum of its proper divisors (1724400404).

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

1565135020 is a wasteful number, since it uses less digits than its factorization.

1565135020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65529 (or 65527 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1565135020 is about 39561.7873711489. The cubic root of 1565135020 is about 1161.0491449641.

The spelling of 1565135020 in words is "one billion, five hundred sixty-five million, one hundred thirty-five thousand, twenty".