1566905945 has 16 divisors (see below), whose sum is σ = 2079326592. Its totient is φ = 1123954560.

The previous prime is 1566905917. The next prime is 1566905971. The reversal of 1566905945 is 5495096651.

It is a happy number.

It is not a de Polignac number, because 1566905945 - 2¹⁰ = 1566904921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1566905893 and 1566905902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191117 + ... + 199146.

It is an arithmetic number, because the mean of its divisors is an integer number (129957912).

Almost surely, 2^1566905945 is an apocalyptic number.

It is an amenable number.

1566905945 is a deficient number, since it is larger than the sum of its proper divisors (512420647).

1566905945 is a wasteful number, since it uses less digits than its factorization.

1566905945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390352.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The square root of 1566905945 is about 39584.1628053443. The cubic root of 1566905945 is about 1161.4868826939.

The spelling of 1566905945 in words is "one billion, five hundred sixty-six million, nine hundred five thousand, nine hundred forty-five".