1266979862404 has 27 divisors (see below), whose sum is σ = 2255668086007. Its totient is φ = 622687528808.

The previous prime is 1266979862363. The next prime is 1266979862413. The reversal of 1266979862404 is 4042689796621.

The square root of 1266979862404 is 1125602.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 132816267 + ... + 132825805.

Almost surely, 2^{1266979862404} is an apocalyptic number.

1266979862404 is the 1125602-nd square number.

It is an amenable number.

1266979862404 is a deficient number, since it is larger than the sum of its proper divisors (988688223603).

1266979862404 is an frugal number, since it uses more digits than its factorization.

1266979862404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19200 (or 9600 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 64.

Multiplying 1266979862404 by its sum of digits (64), we get a square (81086711193856 = 9004816²).

The spelling of 1266979862404 in words is "one trillion, two hundred sixty-six billion, nine hundred seventy-nine million, eight hundred sixty-two thousand, four hundred four".