1225789966 has 4 divisors (see below), whose sum is σ = 1838684952. Its totient is φ = 612894982.

The previous prime is 1225789871. The next prime is 1225789979. The reversal of 1225789966 is 6699875221.

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

It is a super-2 number, since 2×1225789966² = 3005122081492562312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306447490 + ... + 306447493.

It is an arithmetic number, because the mean of its divisors is an integer number (459671238).

Almost surely, 2^1225789966 is an apocalyptic number.

1225789966 is a deficient number, since it is larger than the sum of its proper divisors (612894986).

1225789966 is an equidigital number, since it uses as much as digits as its factorization.

1225789966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612894985.

The product of its digits is 3265920, while the sum is 55.

The square root of 1225789966 is about 35011.2834097809. The cubic root of 1225789966 is about 1070.2174321575.

The spelling of 1225789966 in words is "one billion, two hundred twenty-five million, seven hundred eighty-nine thousand, nine hundred sixty-six".