1266611680 has 24 divisors (see below), whose sum is σ = 2992370472. Its totient is φ = 506644608.

The previous prime is 1266611677. The next prime is 1266611681. The reversal of 1266611680 is 861166621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266611681) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3958002 + ... + 3958321.

It is an arithmetic number, because the mean of its divisors is an integer number (124682103).

Almost surely, 2^1266611680 is an apocalyptic number.

1266611680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266611680 is an abundant number, since it is smaller than the sum of its proper divisors (1725758792).

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

1266611680 is an equidigital number, since it uses as much as digits as its factorization.

1266611680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916338 (or 7916330 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1266611680 is about 35589.4883357432. The cubic root of 1266611680 is about 1081.9681988004.

The spelling of 1266611680 in words is "one billion, two hundred sixty-six million, six hundred eleven thousand, six hundred eighty".