15551066 has 4 divisors (see below), whose sum is σ = 23326602. Its totient is φ = 7775532.

The previous prime is 15551033. The next prime is 15551083. The reversal of 15551066 is 66015551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66015551 = 7 ⋅9430793.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 2337841 = 3635^2 + 1529^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3887765 + ... + 3887768.

Almost surely, 2^15551066 is an apocalyptic number.

15551066 is a deficient number, since it is larger than the sum of its proper divisors (7775536).

15551066 is an equidigital number, since it uses as much as digits as its factorization.

15551066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7775535.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 15551066 is about 3943.4839926136. The cubic root of 15551066 is about 249.6050617570.

The spelling of 15551066 in words is "fifteen million, five hundred fifty-one thousand, sixty-six".