1566061605091 has 2 divisors, whose sum is σ = 1566061605092. Its totient is φ = 1566061605090.

The previous prime is 1566061605037. The next prime is 1566061605131. The reversal of 1566061605091 is 1905061606651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1566061605091 - 2¹⁹ = 1566061080803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566061605191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783030802545 + 783030802546.

It is an arithmetic number, because the mean of its divisors is an integer number (783030802546).

Almost surely, 2^{1566061605091} is an apocalyptic number.

1566061605091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566061605091 is an equidigital number, since it uses as much as digits as its factorization.

1566061605091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 1566061605091 in words is "one trillion, five hundred sixty-six billion, sixty-one million, six hundred five thousand, ninety-one".