1320666156 has 18 divisors (see below), whose sum is σ = 3338350652. Its totient is φ = 440222040.

The previous prime is 1320666121. The next prime is 1320666157. The reversal of 1320666156 is 6516660231.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 36685171 = 1320666156 / (1 + 3 + 2 + 0 + 6 + 6 + 6 + 1 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1320666156.

It is not an unprimeable number, because it can be changed into a prime (1320666157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18342550 + ... + 18342621.

Almost surely, 2^1320666156 is an apocalyptic number.

It is an amenable number.

1320666156 is an abundant number, since it is smaller than the sum of its proper divisors (2017684496).

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

1320666156 is a wasteful number, since it uses less digits than its factorization.

1320666156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36685181 (or 36685176 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1320666156 is about 36340.9707630382. The cubic root of 1320666156 is about 1097.1458116143.

The spelling of 1320666156 in words is "one billion, three hundred twenty million, six hundred sixty-six thousand, one hundred fifty-six".