661533103 has 16 divisors (see below), whose sum is σ = 825442560. Its totient is φ = 515059200.

The previous prime is 661533097. The next prime is 661533167. The reversal of 661533103 is 301335166.

It is a cyclic number.

It is not a de Polignac number, because 661533103 - 2⁵ = 661533071 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 (661539103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118863 + ... + 124303.

It is an arithmetic number, because the mean of its divisors is an integer number (51590160).

Almost surely, 2^661533103 is an apocalyptic number.

661533103 is a deficient number, since it is larger than the sum of its proper divisors (163909457).

661533103 is a wasteful number, since it uses less digits than its factorization.

661533103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7038.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 661533103 is about 25720.2858265611. The cubic root of 661533103 is about 871.3323940502.

Adding to 661533103 its reverse (301335166), we get a palindrome (962868269).

The spelling of 661533103 in words is "six hundred sixty-one million, five hundred thirty-three thousand, one hundred three".