1663435061 has 2 divisors, whose sum is σ = 1663435062. Its totient is φ = 1663435060.

The previous prime is 1663435043. The next prime is 1663435079. The reversal of 1663435061 is 1605343661.

It is a balanced prime because it is at equal distance from previous prime (1663435043) and next prime (1663435079).

It can be written as a sum of positive squares in only one way, i.e., 1086954961 + 576480100 = 32969^2 + 24010^2 .

It is an emirp because it is prime and its reverse (1605343661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663435061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663435021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831717530 + 831717531.

It is an arithmetic number, because the mean of its divisors is an integer number (831717531).

Almost surely, 2^1663435061 is an apocalyptic number.

It is an amenable number.

1663435061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663435061 is an equidigital number, since it uses as much as digits as its factorization.

1663435061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 1663435061 is about 40785.2309175760. The cubic root of 1663435061 is about 1184.8643072504.

The spelling of 1663435061 in words is "one billion, six hundred sixty-three million, four hundred thirty-five thousand, sixty-one".