201243645612 has 60 divisors (see below), whose sum is σ = 527990121120. Its totient is φ = 66839014944.

The previous prime is 201243645611. The next prime is 201243645677. The reversal of 201243645612 is 216546342102.

201243645612 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 4 + 3 + 645 + 6 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (201243645611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1031412 + ... + 1210907.

It is an arithmetic number, because the mean of its divisors is an integer number (8799835352).

Almost surely, 2^201243645612 is an apocalyptic number.

It is an amenable number.

201243645612 is an abundant number, since it is smaller than the sum of its proper divisors (326746475508).

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

201243645612 is a wasteful number, since it uses less digits than its factorization.

201243645612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242612 (or 2242601 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 201243645612 its reverse (216546342102), we get a palindrome (417789987714).

The spelling of 201243645612 in words is "two hundred one billion, two hundred forty-three million, six hundred forty-five thousand, six hundred twelve".