201980237646 has 32 divisors (see below), whose sum is σ = 440918956800. Its totient is φ = 61173521280.

The previous prime is 201980237639. The next prime is 201980237659. The reversal of 201980237646 is 646732089102.

It is a junction number, because it is equal to n+sod(n) for n = 201980237595 and 201980237604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690331 + ... + 938358.

It is an arithmetic number, because the mean of its divisors is an integer number (13778717400).

Almost surely, 2^201980237646 is an apocalyptic number.

201980237646 is an abundant number, since it is smaller than the sum of its proper divisors (238938719154).

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

201980237646 is a wasteful number, since it uses less digits than its factorization.

201980237646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630584.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 201980237646 in words is "two hundred one billion, nine hundred eighty million, two hundred thirty-seven thousand, six hundred forty-six".