1266650625 has 40 divisors (see below), whose sum is σ = 2126244384. Its totient is φ = 670480000.

The previous prime is 1266650587. The next prime is 1266650653. The reversal of 1266650625 is 5260566621.

1266650625 = 333² + 334² + ... + 1565².

It is a happy number.

It is not a de Polignac number, because 1266650625 - 2⁹ = 1266650113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 254410 + ... + 259340.

Almost surely, 2^1266650625 is an apocalyptic number.

1266650625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266650625 is a deficient number, since it is larger than the sum of its proper divisors (859593759).

1266650625 is an equidigital number, since it uses as much as digits as its factorization.

1266650625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5091 (or 5076 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1266650625 is about 35590.0354734299. The cubic root of 1266650625 is about 1081.9792879186.

The spelling of 1266650625 in words is "one billion, two hundred sixty-six million, six hundred fifty thousand, six hundred twenty-five".