1278505323466 has 16 divisors (see below), whose sum is σ = 2320648318656. Its totient is φ = 515699626176.

The previous prime is 1278505323439. The next prime is 1278505323493. The reversal of 1278505323466 is 6643235058721.

It is an interprime number because it is at equal distance from previous prime (1278505323439) and next prime (1278505323493).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2685935316 + ... + 2685935791.

It is an arithmetic number, because the mean of its divisors is an integer number (145040519916).

Almost surely, 2^{1278505323466} is an apocalyptic number.

1278505323466 is a deficient number, since it is larger than the sum of its proper divisors (1042142995190).

1278505323466 is a wasteful number, since it uses less digits than its factorization.

1278505323466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371871133.

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 1278505323466 in words is "one trillion, two hundred seventy-eight billion, five hundred five million, three hundred twenty-three thousand, four hundred sixty-six".