661103525 has 12 divisors (see below), whose sum is σ = 824066304. Its totient is φ = 526110000.

The previous prime is 661103477. The next prime is 661103533. The reversal of 661103525 is 525301166.

It is not a de Polignac number, because 661103525 - 2²⁰ = 660054949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64451 + ... + 74000.

It is an arithmetic number, because the mean of its divisors is an integer number (68672192).

Almost surely, 2^661103525 is an apocalyptic number.

It is an amenable number.

661103525 is a deficient number, since it is larger than the sum of its proper divisors (162962779).

661103525 is a wasteful number, since it uses less digits than its factorization.

661103525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138652 (or 138647 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 661103525 is about 25711.9335134486. The cubic root of 661103525 is about 871.1437482741.

The spelling of 661103525 in words is "six hundred sixty-one million, one hundred three thousand, five hundred twenty-five".