1566621552 has 20 divisors (see below), whose sum is σ = 4047105800. Its totient is φ = 522207168.

The previous prime is 1566621547. The next prime is 1566621559. The reversal of 1566621552 is 2551266651.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1566621552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566621559) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16318927 + ... + 16319022.

It is an arithmetic number, because the mean of its divisors is an integer number (202355290).

Almost surely, 2^1566621552 is an apocalyptic number.

1566621552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1566621552 is an abundant number, since it is smaller than the sum of its proper divisors (2480484248).

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

1566621552 is a wasteful number, since it uses less digits than its factorization.

1566621552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32637960 (or 32637954 counting only the distinct ones).

The product of its digits is 108000, while the sum is 39.

The square root of 1566621552 is about 39580.5703849755. The cubic root of 1566621552 is about 1161.4166085917.

The spelling of 1566621552 in words is "one billion, five hundred sixty-six million, six hundred twenty-one thousand, five hundred fifty-two".