10661638 has 8 divisors (see below), whose sum is σ = 17222688. Its totient is φ = 4920744.

The previous prime is 10661611. The next prime is 10661653. The reversal of 10661638 is 83616601.

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

It is a super-2 number, since 2×10661638² = 227341049686088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205006 + ... + 205057.

It is an arithmetic number, because the mean of its divisors is an integer number (2152836).

Almost surely, 2^10661638 is an apocalyptic number.

10661638 is a deficient number, since it is larger than the sum of its proper divisors (6561050).

10661638 is a wasteful number, since it uses less digits than its factorization.

10661638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410078.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 10661638 is about 3265.2163787412. The cubic root of 10661638 is about 220.0938855482.

It can be divided in two parts, 1066 and 1638, that added together give a square (2704 = 52²).

The spelling of 10661638 in words is "ten million, six hundred sixty-one thousand, six hundred thirty-eight".