1266240225 has 48 divisors (see below), whose sum is σ = 2140737984. Its totient is φ = 660192000.

The previous prime is 1266240211. The next prime is 1266240251. The reversal of 1266240225 is 5220426621.

It is a happy number.

It is not a de Polignac number, because 1266240225 - 2⁷ = 1266240097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266240192 and 1266240201.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1832130 + ... + 1832820.

It is an arithmetic number, because the mean of its divisors is an integer number (44598708).

Almost surely, 2^1266240225 is an apocalyptic number.

1266240225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266240225 is a deficient number, since it is larger than the sum of its proper divisors (874497759).

1266240225 is a wasteful number, since it uses less digits than its factorization.

1266240225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1266240225 is about 35584.2693475642. The cubic root of 1266240225 is about 1081.8624200528.

Adding to 1266240225 its reverse (5220426621), we get a palindrome (6486666846).

The spelling of 1266240225 in words is "one billion, two hundred sixty-six million, two hundred forty thousand, two hundred twenty-five".