1266721676 has 12 divisors (see below), whose sum is σ = 2418286920. Its totient is φ = 575782560.

The previous prime is 1266721639. The next prime is 1266721717. The reversal of 1266721676 is 6761276621.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 28789129 = 1266721676 / (1 + 2 + 6 + 6 + 7 + 2 + 1 + 6 + 7 + 6).

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, 14394521 + ... + 14394608.

It is an arithmetic number, because the mean of its divisors is an integer number (201523910).

Almost surely, 2^1266721676 is an apocalyptic number.

It is an amenable number.

1266721676 is a deficient number, since it is larger than the sum of its proper divisors (1151565244).

1266721676 is a wasteful number, since it uses less digits than its factorization.

1266721676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28789144 (or 28789142 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 1266721676 is about 35591.0336461306. The cubic root of 1266721676 is about 1081.9995182466. Note that the first 3 decimals are identical.

Subtracting 1266721676 from its reverse (6761276621), we obtain a palindrome (5494554945).

It can be divided in two parts, 12667 and 21676, that added together give a palindrome (34343).

The spelling of 1266721676 in words is "one billion, two hundred sixty-six million, seven hundred twenty-one thousand, six hundred seventy-six".