1266377660 has 24 divisors (see below), whose sum is σ = 2724258096. Its totient is φ = 494195840.

The previous prime is 1266377659. The next prime is 1266377689. The reversal of 1266377660 is 667736621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771362 + ... + 773001.

It is an arithmetic number, because the mean of its divisors is an integer number (113510754).

Almost surely, 2^1266377660 is an apocalyptic number.

1266377660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266377660 is an abundant number, since it is smaller than the sum of its proper divisors (1457880436).

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

1266377660 is a wasteful number, since it uses less digits than its factorization.

1266377660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544413 (or 1544411 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 1266377660 is about 35586.2004153295. The cubic root of 1266377660 is about 1081.9015596462.

The spelling of 1266377660 in words is "one billion, two hundred sixty-six million, three hundred seventy-seven thousand, six hundred sixty".