1661235353 has 2 divisors, whose sum is σ = 1661235354. Its totient is φ = 1661235352.

The previous prime is 1661235349. The next prime is 1661235403. The reversal of 1661235353 is 3535321661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1609855129 + 51380224 = 40123^2 + 7168^2 .

It is an emirp because it is prime and its reverse (3535321661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1661235353 - 2² = 1661235349 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661235313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830617676 + 830617677.

It is an arithmetic number, because the mean of its divisors is an integer number (830617677).

Almost surely, 2^1661235353 is an apocalyptic number.

It is an amenable number.

1661235353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661235353 is an equidigital number, since it uses as much as digits as its factorization.

1661235353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 35.

The square root of 1661235353 is about 40758.2550288895. The cubic root of 1661235353 is about 1184.3417930721.

The spelling of 1661235353 in words is "one billion, six hundred sixty-one million, two hundred thirty-five thousand, three hundred fifty-three".