1566415820 has 12 divisors (see below), whose sum is σ = 3289473264. Its totient is φ = 626566320.

The previous prime is 1566415817. The next prime is 1566415867. The reversal of 1566415820 is 285146651.

It is a happy number.

It is a super-2 number, since 2×1566415820² = 4907317042292544800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39160376 + ... + 39160415.

It is an arithmetic number, because the mean of its divisors is an integer number (274122772).

Almost surely, 2^1566415820 is an apocalyptic number.

1566415820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566415820 is an abundant number, since it is smaller than the sum of its proper divisors (1723057444).

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

1566415820 is a wasteful number, since it uses less digits than its factorization.

1566415820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78320800 (or 78320798 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1566415820 is about 39577.9713982412. The cubic root of 1566415820 is about 1161.3657664847.

The spelling of 1566415820 in words is "one billion, five hundred sixty-six million, four hundred fifteen thousand, eight hundred twenty".