1565555652 has 18 divisors (see below), whose sum is σ = 3957376878. Its totient is φ = 521851872.

The previous prime is 1565555647. The next prime is 1565555669. The reversal of 1565555652 is 2565555651.

It can be written as a sum of positive squares in only one way, i.e., 1302921216 + 262634436 = 36096^2 + 16206^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 1565555598 and 1565555607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21743793 + ... + 21743864.

It is an arithmetic number, because the mean of its divisors is an integer number (219854271).

Almost surely, 2^1565555652 is an apocalyptic number.

1565555652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1565555652 is an abundant number, since it is smaller than the sum of its proper divisors (2391821226).

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

1565555652 is a wasteful number, since it uses less digits than its factorization.

1565555652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43487667 (or 43487662 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

The square root of 1565555652 is about 39567.1031540091. The cubic root of 1565555652 is about 1161.1531467859.

Subtracting 1565555652 from its reverse (2565555651), we obtain a palindrome (999999999).

The spelling of 1565555652 in words is "one billion, five hundred sixty-five million, five hundred fifty-five thousand, six hundred fifty-two".