1565664534 has 24 divisors (see below), whose sum is σ = 3876883920. Its totient is φ = 447332688.

The previous prime is 1565664497. The next prime is 1565664547. The reversal of 1565664534 is 4354665651.

1565664534 is a `hidden beast` number, since 1 + 5 + 6 + 56 + 64 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1565664534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6212829 + ... + 6213080.

It is an arithmetic number, because the mean of its divisors is an integer number (161536830).

Almost surely, 2^1565664534 is an apocalyptic number.

1565664534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1565664534 is an abundant number, since it is smaller than the sum of its proper divisors (2311219386).

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

1565664534 is a wasteful number, since it uses less digits than its factorization.

1565664534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12425924 (or 12425921 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The square root of 1565664534 is about 39568.4790458264. The cubic root of 1565664534 is about 1161.1800649700.

The spelling of 1565664534 in words is "one billion, five hundred sixty-five million, six hundred sixty-four thousand, five hundred thirty-four".