19661063 has 2 divisors, whose sum is σ = 19661064. Its totient is φ = 19661062.

The previous prime is 19661053. The next prime is 19661119. The reversal of 19661063 is 36016691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19661063 - 2⁶ = 19660999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19661003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9830531 + 9830532.

It is an arithmetic number, because the mean of its divisors is an integer number (9830532).

Almost surely, 2^19661063 is an apocalyptic number.

19661063 is a deficient number, since it is larger than the sum of its proper divisors (1).

19661063 is an equidigital number, since it uses as much as digits as its factorization.

19661063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 19661063 is about 4434.0797241367. The cubic root of 19661063 is about 269.8996563569.

The spelling of 19661063 in words is "nineteen million, six hundred sixty-one thousand, sixty-three".