1566643455 has 48 divisors (see below), whose sum is σ = 3003480480. Its totient is φ = 750415104.

The previous prime is 1566643417. The next prime is 1566643457. The reversal of 1566643455 is 5543466651.

It is not a de Polignac number, because 1566643455 - 2¹⁷ = 1566512383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1566643455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566643457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14545 + ... + 57834.

It is an arithmetic number, because the mean of its divisors is an integer number (62572510).

Almost surely, 2^1566643455 is an apocalyptic number.

1566643455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1566643455 is a deficient number, since it is larger than the sum of its proper divisors (1436837025).

1566643455 is a wasteful number, since it uses less digits than its factorization.

1566643455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72440 (or 72437 counting only the distinct ones).

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

The square root of 1566643455 is about 39580.8470727952. The cubic root of 1566643455 is about 1161.4220211709.

The spelling of 1566643455 in words is "one billion, five hundred sixty-six million, six hundred forty-three thousand, four hundred fifty-five".