15506066 has 4 divisors (see below), whose sum is σ = 23259102. Its totient is φ = 7753032.

The previous prime is 15506063. The next prime is 15506069. The reversal of 15506066 is 66060551.

15506066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (15506063) and next prime (15506069).

It can be written as a sum of positive squares in only one way, i.e., 9150625 + 6355441 = 3025^2 + 2521^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15506063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3876515 + ... + 3876518.

Almost surely, 2^15506066 is an apocalyptic number.

15506066 is a deficient number, since it is larger than the sum of its proper divisors (7753036).

15506066 is an equidigital number, since it uses as much as digits as its factorization.

15506066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7753035.

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

The square root of 15506066 is about 3937.7742444178. The cubic root of 15506066 is about 249.3640690724.

The spelling of 15506066 in words is "fifteen million, five hundred six thousand, sixty-six".