1266600664 has 16 divisors (see below), whose sum is σ = 2714144400. Its totient is φ = 542828832.

The previous prime is 1266600641. The next prime is 1266600677. The reversal of 1266600664 is 4660066621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11308879 + ... + 11308990.

It is an arithmetic number, because the mean of its divisors is an integer number (169634025).

Almost surely, 2^1266600664 is an apocalyptic number.

1266600664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1266600664 is an abundant number, since it is smaller than the sum of its proper divisors (1447543736).

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

1266600664 is a wasteful number, since it uses less digits than its factorization.

1266600664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22617882 (or 22617878 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1266600664 is about 35589.3335706079. Note that the first 3 decimals coincide. The cubic root of 1266600664 is about 1081.9650620863.

The spelling of 1266600664 in words is "one billion, two hundred sixty-six million, six hundred thousand, six hundred sixty-four".