201635645 has 12 divisors (see below), whose sum is σ = 243340020. Its totient is φ = 160395264.

The previous prime is 201635617. The next prime is 201635677. The reversal of 201635645 is 546536102.

201635645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 29789764 + 171845881 = 5458^2 + 13109^2 .

It is not a de Polignac number, because 201635645 - 2⁸ = 201635389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261821 + ... + 262589.

It is an arithmetic number, because the mean of its divisors is an integer number (20278335).

Almost surely, 2^201635645 is an apocalyptic number.

It is an amenable number.

201635645 is a deficient number, since it is larger than the sum of its proper divisors (41704375).

201635645 is an frugal number, since it uses more digits than its factorization.

201635645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 201635645 is about 14199.8466541016. The cubic root of 201635645 is about 586.3934396536.

The spelling of 201635645 in words is "two hundred one million, six hundred thirty-five thousand, six hundred forty-five".