1225661768 has 8 divisors (see below), whose sum is σ = 2298115830. Its totient is φ = 612830880.

The previous prime is 1225661737. The next prime is 1225661813. The reversal of 1225661768 is 8671665221.

It can be written as a sum of positive squares in only one way, i.e., 1210900804 + 14760964 = 34798^2 + 3842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76603853 + ... + 76603868.

Almost surely, 2^1225661768 is an apocalyptic number.

It is an amenable number.

1225661768 is a deficient number, since it is larger than the sum of its proper divisors (1072454062).

1225661768 is a wasteful number, since it uses less digits than its factorization.

1225661768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153207727 (or 153207723 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 1225661768 is about 35009.4525521323. The cubic root of 1225661768 is about 1070.1801216553.

The spelling of 1225661768 in words is "one billion, two hundred twenty-five million, six hundred sixty-one thousand, seven hundred sixty-eight".