1535883661 has 12 divisors (see below), whose sum is σ = 1694506068. Its totient is φ = 1390980864.

The previous prime is 1535883659. The next prime is 1535883731. The reversal of 1535883661 is 1663885351.

It can be written as a sum of positive squares in 6 ways, for example, as 325261225 + 1210622436 = 18035^2 + 34794^2 .

It is not a de Polignac number, because 1535883661 - 2¹ = 1535883659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1535883611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76780 + ... + 94693.

It is an arithmetic number, because the mean of its divisors is an integer number (141208839).

Almost surely, 2^1535883661 is an apocalyptic number.

It is an amenable number.

1535883661 is a deficient number, since it is larger than the sum of its proper divisors (158622407).

1535883661 is a wasteful number, since it uses less digits than its factorization.

1535883661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171552 (or 171539 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The square root of 1535883661 is about 39190.3516314922. The cubic root of 1535883661 is about 1153.7705253242.

The spelling of 1535883661 in words is "one billion, five hundred thirty-five million, eight hundred eighty-three thousand, six hundred sixty-one".