1326278785644 has 36 divisors (see below), whose sum is σ = 3498300567216. Its totient is φ = 422871496608.

The previous prime is 1326278785633. The next prime is 1326278785729. The reversal of 1326278785644 is 4465878726231.

1326278785644 is a `hidden beast` number, since 1 + 3 + 2 + 62 + 7 + 8 + 7 + 8 + 564 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800892159 + ... + 800893814.

It is an arithmetic number, because the mean of its divisors is an integer number (97175015756).

Almost surely, 2^{1326278785644} is an apocalyptic number.

It is an amenable number.

1326278785644 is an abundant number, since it is smaller than the sum of its proper divisors (2172021781572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1326278785644 is a wasteful number, since it uses less digits than its factorization.

1326278785644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601786006 (or 1601786001 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 63.

The spelling of 1326278785644 in words is "one trillion, three hundred twenty-six billion, two hundred seventy-eight million, seven hundred eighty-five thousand, six hundred forty-four".