1266378766264 has 32 divisors (see below), whose sum is σ = 2451759459840. Its totient is φ = 612587973600.

The previous prime is 1266378766253. The next prime is 1266378766267. The reversal of 1266378766264 is 4626678736621.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1266378766196 and 1266378766205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266378766267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134407 + ... + 1597129.

It is an arithmetic number, because the mean of its divisors is an integer number (76617483120).

Almost surely, 2^{1266378766264} is an apocalyptic number.

It is an amenable number.

1266378766264 is a deficient number, since it is larger than the sum of its proper divisors (1185380693576).

1266378766264 is a wasteful number, since it uses less digits than its factorization.

1266378766264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466251 (or 1466247 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 64.

The spelling of 1266378766264 in words is "one trillion, two hundred sixty-six billion, three hundred seventy-eight million, seven hundred sixty-six thousand, two hundred sixty-four".