12645554 has 4 divisors (see below), whose sum is σ = 18968334. Its totient is φ = 6322776.

The previous prime is 12645547. The next prime is 12645623. The reversal of 12645554 is 45554621.

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

It can be written as a sum of positive squares in only one way, i.e., 8862529 + 3783025 = 2977^2 + 1945^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12645554.

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 as a sum of consecutive naturals, namely, 3161387 + ... + 3161390.

Almost surely, 2^12645554 is an apocalyptic number.

12645554 is a deficient number, since it is larger than the sum of its proper divisors (6322780).

12645554 is an equidigital number, since it uses as much as digits as its factorization.

12645554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322779.

The product of its digits is 24000, while the sum is 32.

The square root of 12645554 is about 3556.0587734176. The cubic root of 12645554 is about 232.9767701426.

The spelling of 12645554 in words is "twelve million, six hundred forty-five thousand, five hundred fifty-four".