103556661 has 16 divisors (see below), whose sum is σ = 149264640. Its totient is φ = 63483840.

The previous prime is 103556591. The next prime is 103556683. The reversal of 103556661 is 166655301.

It is not a de Polignac number, because 103556661 - 2¹¹ = 103554613 is a prime.

It is a super-3 number, since 3×103556661³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103556261) 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, 5556 + ... + 15426.

It is an arithmetic number, because the mean of its divisors is an integer number (9329040).

Almost surely, 2^103556661 is an apocalyptic number.

It is an amenable number.

103556661 is a deficient number, since it is larger than the sum of its proper divisors (45707979).

103556661 is a wasteful number, since it uses less digits than its factorization.

103556661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 103556661 is about 10176.2793298926. The cubic root of 103556661 is about 469.5977560386.

The spelling of 103556661 in words is "one hundred three million, five hundred fifty-six thousand, six hundred sixty-one".