1566609940 has 24 divisors (see below), whose sum is σ = 3759864192. Its totient is φ = 537123360.

The previous prime is 1566609923. The next prime is 1566609943. The reversal of 1566609940 is 499066651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566609943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5594896 + ... + 5595175.

It is an arithmetic number, because the mean of its divisors is an integer number (156661008).

Almost surely, 2^1566609940 is an apocalyptic number.

1566609940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566609940 is an abundant number, since it is smaller than the sum of its proper divisors (2193254252).

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

1566609940 is a wasteful number, since it uses less digits than its factorization.

1566609940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11190087 (or 11190085 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 1566609940 is about 39580.4236965700. The cubic root of 1566609940 is about 1161.4137390617.

The spelling of 1566609940 in words is "one billion, five hundred sixty-six million, six hundred nine thousand, nine hundred forty".