1566969497 has 2 divisors, whose sum is σ = 1566969498. Its totient is φ = 1566969496.

The previous prime is 1566969451. The next prime is 1566969559. The reversal of 1566969497 is 7949696651.

It is an a-pointer prime, because the next prime (1566969559) can be obtained adding 1566969497 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821624896 + 745344601 = 28664^2 + 27301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1566969497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566969427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783484748 + 783484749.

It is an arithmetic number, because the mean of its divisors is an integer number (783484749).

Almost surely, 2^1566969497 is an apocalyptic number.

It is an amenable number.

1566969497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566969497 is an equidigital number, since it uses as much as digits as its factorization.

1566969497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22044960, while the sum is 62.

The square root of 1566969497 is about 39584.9655424885. The cubic root of 1566969497 is about 1161.5025853629.

The spelling of 1566969497 in words is "one billion, five hundred sixty-six million, nine hundred sixty-nine thousand, four hundred ninety-seven".