1201789965312 has 110 divisors (see below), whose sum is σ = 3588780040538. Its totient is φ = 400596627456.

The previous prime is 1201789965263. The next prime is 1201789965319. The reversal of 1201789965312 is 2135699871021.

It is a happy number.

1201789965312 is a `hidden beast` number, since 1 + 2 + 0 + 17 + 8 + 9 + 96 + 531 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1187018966016 + 14770999296 = 1089504^2 + 121536^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201789965319) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7161643 + ... + 7327530.

Almost surely, 2^{1201789965312} is an apocalyptic number.

1201789965312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1201789965312 is an abundant number, since it is smaller than the sum of its proper divisors (2386990075226).

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

1201789965312 is an equidigital number, since it uses as much as digits as its factorization.

1201789965312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14489205 (or 14489178 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 1201789965312 in words is "one trillion, two hundred one billion, seven hundred eighty-nine million, nine hundred sixty-five thousand, three hundred twelve".