1566646065 has 72 divisors (see below), whose sum is σ = 2832036480. Its totient is φ = 800762112.

The previous prime is 1566646063. The next prime is 1566646069. The reversal of 1566646065 is 5606466651.

It is not a de Polignac number, because 1566646065 - 2¹ = 1566646063 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 1566646065.

It is not an unprimeable number, because it can be changed into a prime (1566646063) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11270766 + ... + 11270904.

It is an arithmetic number, because the mean of its divisors is an integer number (39333840).

Almost surely, 2^1566646065 is an apocalyptic number.

1566646065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1566646065 is a deficient number, since it is larger than the sum of its proper divisors (1265390415).

1566646065 is a wasteful number, since it uses less digits than its factorization.

1566646065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 1566646065 is about 39580.8800432734. The cubic root of 1566646065 is about 1161.4226661400.

The spelling of 1566646065 in words is "one billion, five hundred sixty-six million, six hundred forty-six thousand, sixty-five".