103661553 has 8 divisors (see below), whose sum is σ = 138441888. Its totient is φ = 68994464.

The previous prime is 103661527. The next prime is 103661581. The reversal of 103661553 is 355166301.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 103661553 - 2⁵ = 103661521 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 103661553.

It is not an unprimeable number, because it can be changed into a prime (103661513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26151 + ... + 29852.

It is an arithmetic number, because the mean of its divisors is an integer number (17305236).

Almost surely, 2^103661553 is an apocalyptic number.

It is an amenable number.

103661553 is a deficient number, since it is larger than the sum of its proper divisors (34780335).

103661553 is an equidigital number, since it uses as much as digits as its factorization.

103661553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56623.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 103661553 is about 10181.4317755412. The cubic root of 103661553 is about 469.7562535734.

The spelling of 103661553 in words is "one hundred three million, six hundred sixty-one thousand, five hundred fifty-three".