1388330972666 has 32 divisors (see below), whose sum is σ = 2348690674176. Its totient is φ = 609767352000.

The previous prime is 1388330972659. The next prime is 1388330972711. The reversal of 1388330972666 is 6662790338831.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a junction number, because it is equal to n+sod(n) for n = 1388330972599 and 1388330972608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1113365 + ... + 2004056.

It is an arithmetic number, because the mean of its divisors is an integer number (73396583568).

Almost surely, 2^{1388330972666} is an apocalyptic number.

1388330972666 is a deficient number, since it is larger than the sum of its proper divisors (960359701510).

1388330972666 is a wasteful number, since it uses less digits than its factorization.

1388330972666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118118.

The product of its (nonzero) digits is 47029248, while the sum is 62.

The spelling of 1388330972666 in words is "one trillion, three hundred eighty-eight billion, three hundred thirty million, nine hundred seventy-two thousand, six hundred sixty-six".