1565066973 has 4 divisors (see below), whose sum is σ = 2086755968. Its totient is φ = 1043377980.

The previous prime is 1565066957. The next prime is 1565067011. The reversal of 1565066973 is 3796605651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3796605651 = 3 ⋅1265535217.

It is not a de Polignac number, because 1565066973 - 2⁴ = 1565066957 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 (1565066953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260844493 + ... + 260844498.

It is an arithmetic number, because the mean of its divisors is an integer number (521688992).

Almost surely, 2^1565066973 is an apocalyptic number.

It is an amenable number.

1565066973 is a deficient number, since it is larger than the sum of its proper divisors (521688995).

1565066973 is an equidigital number, since it uses as much as digits as its factorization.

1565066973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521688994.

The product of its (nonzero) digits is 1020600, while the sum is 48.

The square root of 1565066973 is about 39560.9273526291. The cubic root of 1565066973 is about 1161.0323185019.

The spelling of 1565066973 in words is "one billion, five hundred sixty-five million, sixty-six thousand, nine hundred seventy-three".