1562665661 has 16 divisors (see below), whose sum is σ = 1596672000. Its totient is φ = 1529185728.

The previous prime is 1562665631. The next prime is 1562665669. The reversal of 1562665661 is 1665662651.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1562665661 - 2⁶ = 1562665597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1562665669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4079876 + ... + 4080258.

It is an arithmetic number, because the mean of its divisors is an integer number (99792000).

Almost surely, 2^1562665661 is an apocalyptic number.

It is an amenable number.

1562665661 is a deficient number, since it is larger than the sum of its proper divisors (34006339).

1562665661 is a wasteful number, since it uses less digits than its factorization.

1562665661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its digits is 388800, while the sum is 44.

The square root of 1562665661 is about 39530.5661608837. The cubic root of 1562665661 is about 1160.4382165672.

The spelling of 1562665661 in words is "one billion, five hundred sixty-two million, six hundred sixty-five thousand, six hundred sixty-one".