1566765461 has 4 divisors (see below), whose sum is σ = 1572421932. Its totient is φ = 1561108992.

The previous prime is 1566765413. The next prime is 1566765463. The reversal of 1566765461 is 1645676651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1645676651 = 457 ⋅3601043.

It can be written as a sum of positive squares in 2 ways, for example, as 649281361 + 917484100 = 25481^2 + 30290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566765461 - 2²⁶ = 1499656597 is a prime.

It is a super-3 number, since 3×1566765461³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566765463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827820 + ... + 2828373.

It is an arithmetic number, because the mean of its divisors is an integer number (393105483).

Almost surely, 2^1566765461 is an apocalyptic number.

It is an amenable number.

1566765461 is a deficient number, since it is larger than the sum of its proper divisors (5656471).

1566765461 is an equidigital number, since it uses as much as digits as its factorization.

1566765461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5656470.

The product of its digits is 907200, while the sum is 47.

The square root of 1566765461 is about 39582.3882680164. The cubic root of 1566765461 is about 1161.4521698680.

The spelling of 1566765461 in words is "one billion, five hundred sixty-six million, seven hundred sixty-five thousand, four hundred sixty-one".