201261644521 has 8 divisors (see below), whose sum is σ = 230033577600. Its totient is φ = 172494778848.

The previous prime is 201261644501. The next prime is 201261644567. The reversal of 201261644521 is 125446162102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201261644521 - 2⁷ = 201261644393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201261644501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1181356 + ... + 1340941.

It is an arithmetic number, because the mean of its divisors is an integer number (28754197200).

Almost surely, 2^201261644521 is an apocalyptic number.

It is an amenable number.

201261644521 is a deficient number, since it is larger than the sum of its proper divisors (28771933079).

201261644521 is a wasteful number, since it uses less digits than its factorization.

201261644521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533703.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 201261644521 in words is "two hundred one billion, two hundred sixty-one million, six hundred forty-four thousand, five hundred twenty-one".