1278140411266 has 8 divisors (see below), whose sum is σ = 1917215458704. Its totient is φ = 639068591700.

The previous prime is 1278140411209. The next prime is 1278140411333. The reversal of 1278140411266 is 6621140418721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1278140411266² (a number of 25 digits) contains 22 as substring.

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, 935161 + ... + 1852243.

It is an arithmetic number, because the mean of its divisors is an integer number (239651932338).

Almost surely, 2^{1278140411266} is an apocalyptic number.

1278140411266 is a deficient number, since it is larger than the sum of its proper divisors (639075047438).

1278140411266 is an equidigital number, since it uses as much as digits as its factorization.

1278140411266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613936.

The product of its (nonzero) digits is 129024, while the sum is 43.

Adding to 1278140411266 its reverse (6621140418721), we get a palindrome (7899280829987).

The spelling of 1278140411266 in words is "one trillion, two hundred seventy-eight billion, one hundred forty million, four hundred eleven thousand, two hundred sixty-six".