1225725766 has 4 divisors (see below), whose sum is σ = 1838588652. Its totient is φ = 612862882.

The previous prime is 1225725763. The next prime is 1225725773. The reversal of 1225725766 is 6675275221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6675275221 = 2251 ⋅2965471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225725763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306431440 + ... + 306431443.

It is an arithmetic number, because the mean of its divisors is an integer number (459647163).

Almost surely, 2^1225725766 is an apocalyptic number.

1225725766 is the 22143-rd centered pentagonal number.

1225725766 is a deficient number, since it is larger than the sum of its proper divisors (612862886).

1225725766 is an equidigital number, since it uses as much as digits as its factorization.

1225725766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612862885.

The product of its digits is 352800, while the sum is 43.

The square root of 1225725766 is about 35010.3665504947. The cubic root of 1225725766 is about 1070.1987478368.

The spelling of 1225725766 in words is "one billion, two hundred twenty-five million, seven hundred twenty-five thousand, seven hundred sixty-six".