10166561491 has 2 divisors, whose sum is σ = 10166561492. Its totient is φ = 10166561490.

The previous prime is 10166561443. The next prime is 10166561539. The reversal of 10166561491 is 19416566101.

It is a balanced prime because it is at equal distance from previous prime (10166561443) and next prime (10166561539).

It is a cyclic number.

It is not a de Polignac number, because 10166561491 - 2²³ = 10158172883 is a prime.

It is not a weakly prime, because it can be changed into another prime (10166561191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5083280745 + 5083280746.

It is an arithmetic number, because the mean of its divisors is an integer number (5083280746).

Almost surely, 2^10166561491 is an apocalyptic number.

10166561491 is a deficient number, since it is larger than the sum of its proper divisors (1).

10166561491 is an equidigital number, since it uses as much as digits as its factorization.

10166561491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 10166561491 in words is "ten billion, one hundred sixty-six million, five hundred sixty-one thousand, four hundred ninety-one".