1226623666 has 4 divisors (see below), whose sum is σ = 1839935502. Its totient is φ = 613311832.

The previous prime is 1226623637. The next prime is 1226623681. The reversal of 1226623666 is 6663266221.

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., 1114157641 + 112466025 = 33379^2 + 10605^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306655915 + ... + 306655918.

Almost surely, 2^1226623666 is an apocalyptic number.

1226623666 is a deficient number, since it is larger than the sum of its proper divisors (613311836).

1226623666 is an equidigital number, since it uses as much as digits as its factorization.

1226623666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613311835.

The product of its digits is 186624, while the sum is 40.

The square root of 1226623666 is about 35023.1875476805. The cubic root of 1226623666 is about 1070.4600071754.

Adding to 1226623666 its reverse (6663266221), we get a palindrome (7889889887).

The spelling of 1226623666 in words is "one billion, two hundred twenty-six million, six hundred twenty-three thousand, six hundred sixty-six".