1266665250 has 32 divisors (see below), whose sum is σ = 3161598336. Its totient is φ = 337777200.

The previous prime is 1266665249. The next prime is 1266665261. The reversal of 1266665250 is 525666621.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1266665199 and 1266665208.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843694 + ... + 845193.

It is an arithmetic number, because the mean of its divisors is an integer number (98799948).

Almost surely, 2^1266665250 is an apocalyptic number.

1266665250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1266665250 is an abundant number, since it is smaller than the sum of its proper divisors (1894933086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266665250 is a wasteful number, since it uses less digits than its factorization.

1266665250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688907 (or 1688897 counting only the distinct ones).

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

The square root of 1266665250 is about 35590.2409376503. The cubic root of 1266665250 is about 1081.9834521519.

The spelling of 1266665250 in words is "one billion, two hundred sixty-six million, six hundred sixty-five thousand, two hundred fifty".