1566762481 has 2 divisors, whose sum is σ = 1566762482. Its totient is φ = 1566762480.

The previous prime is 1566762469. The next prime is 1566762487. The reversal of 1566762481 is 1842676651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1479171600 + 87590881 = 38460^2 + 9359^2 .

It is an emirp because it is prime and its reverse (1842676651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1566762481 - 2¹⁵ = 1566729713 is a prime.

It is a super-2 number, since 2×1566762481² = 4909489343738550722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1566762487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783381240 + 783381241.

It is an arithmetic number, because the mean of its divisors is an integer number (783381241).

Almost surely, 2^1566762481 is an apocalyptic number.

It is an amenable number.

1566762481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566762481 is an equidigital number, since it uses as much as digits as its factorization.

1566762481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 1566762481 is about 39582.3506249945. The cubic root of 1566762481 is about 1161.4514335038.

The spelling of 1566762481 in words is "one billion, five hundred sixty-six million, seven hundred sixty-two thousand, four hundred eighty-one".