1266938064 has 80 divisors (see below), whose sum is σ = 4156103040. Its totient is φ = 361981440.

The previous prime is 1266938059. The next prime is 1266938081. The reversal of 1266938064 is 4608396621.

1266938064 is a `hidden beast` number, since 1 + 266 + 9 + 380 + 6 + 4 = 666.

It is a congruent number.

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, 206457 + ... + 212504.

It is an arithmetic number, because the mean of its divisors is an integer number (51951288).

Almost surely, 2^1266938064 is an apocalyptic number.

1266938064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1266938064 is an abundant number, since it is smaller than the sum of its proper divisors (2889164976).

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

1266938064 is a wasteful number, since it uses less digits than its factorization.

1266938064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418985 (or 418973 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 1266938064 is about 35594.0734392679. The cubic root of 1266938064 is about 1082.0611256714.

The spelling of 1266938064 in words is "one billion, two hundred sixty-six million, nine hundred thirty-eight thousand, sixty-four".