1225060661 has 32 divisors (see below), whose sum is σ = 1423070208. Its totient is φ = 1043722240.

The previous prime is 1225060651. The next prime is 1225060667. The reversal of 1225060661 is 1660605221.

It is not a de Polignac number, because 1225060661 - 2⁶ = 1225060597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225060667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4766645 + ... + 4766901.

It is an arithmetic number, because the mean of its divisors is an integer number (44470944).

Almost surely, 2^1225060661 is an apocalyptic number.

1225060661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1225060661 is a deficient number, since it is larger than the sum of its proper divisors (198009547).

1225060661 is a wasteful number, since it uses less digits than its factorization.

1225060661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1225060661 is about 35000.8665749864. The cubic root of 1225060661 is about 1070.0051419091.

Adding to 1225060661 its reverse (1660605221), we get a palindrome (2885665882).

The spelling of 1225060661 in words is "one billion, two hundred twenty-five million, sixty thousand, six hundred sixty-one".