1635664141 has 2 divisors, whose sum is σ = 1635664142. Its totient is φ = 1635664140.

The previous prime is 1635664117. The next prime is 1635664169. The reversal of 1635664141 is 1414665361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 854685225 + 780978916 = 29235^2 + 27946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1635664141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1635664141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1635664241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817832070 + 817832071.

It is an arithmetic number, because the mean of its divisors is an integer number (817832071).

Almost surely, 2^1635664141 is an apocalyptic number.

It is an amenable number.

1635664141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1635664141 is an equidigital number, since it uses as much as digits as its factorization.

1635664141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 1635664141 is about 40443.3448295266. The cubic root of 1635664141 is about 1178.2335296933.

The spelling of 1635664141 in words is "one billion, six hundred thirty-five million, six hundred sixty-four thousand, one hundred forty-one".