1266994625 has 24 divisors (see below), whose sum is σ = 1704771432. Its totient is φ = 934567200.

The previous prime is 1266994621. The next prime is 1266994633. The reversal of 1266994625 is 5264996621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 199600384 + 1067394241 = 14128^2 + 32671^2 .

It is not a de Polignac number, because 1266994625 - 2² = 1266994621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266994621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1434434 + ... + 1435316.

It is an arithmetic number, because the mean of its divisors is an integer number (71032143).

Almost surely, 2^1266994625 is an apocalyptic number.

It is an amenable number.

1266994625 is a deficient number, since it is larger than the sum of its proper divisors (437776807).

1266994625 is an frugal number, since it uses more digits than its factorization.

1266994625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 901 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 50.

The square root of 1266994625 is about 35594.8679587381. The cubic root of 1266994625 is about 1082.0772278920.

The spelling of 1266994625 in words is "one billion, two hundred sixty-six million, nine hundred ninety-four thousand, six hundred twenty-five".