201210666642 has 24 divisors (see below), whose sum is σ = 454911073344. Its totient is φ = 64154125464.

The previous prime is 201210666641. The next prime is 201210666649. The reversal of 201210666642 is 246666012102.

It is a junction number, because it is equal to n+sod(n) for n = 201210666597 and 201210666606.

It is not an unprimeable number, because it can be changed into a prime (201210666641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243007638 + ... + 243008465.

It is an arithmetic number, because the mean of its divisors is an integer number (18954628056).

Almost surely, 2^201210666642 is an apocalyptic number.

201210666642 is an abundant number, since it is smaller than the sum of its proper divisors (253700406702).

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

201210666642 is a wasteful number, since it uses less digits than its factorization.

201210666642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486016134 (or 486016131 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 201210666642 its reverse (246666012102), we get a palindrome (447876678744).

The spelling of 201210666642 in words is "two hundred one billion, two hundred ten million, six hundred sixty-six thousand, six hundred forty-two".