1266664520 has 32 divisors (see below), whose sum is σ = 3109086720. Its totient is φ = 460605120.

The previous prime is 1266664517. The next prime is 1266664541. The reversal of 1266664520 is 254666621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438952 + ... + 1439831.

It is an arithmetic number, because the mean of its divisors is an integer number (97158960).

Almost surely, 2^1266664520 is an apocalyptic number.

1266664520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266664520 is an abundant number, since it is smaller than the sum of its proper divisors (1842422200).

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

1266664520 is a wasteful number, since it uses less digits than its factorization.

1266664520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878805 (or 2878801 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 1266664520 is about 35590.2306820285. The cubic root of 1266664520 is about 1081.9832442969.

The spelling of 1266664520 in words is "one billion, two hundred sixty-six million, six hundred sixty-four thousand, five hundred twenty".