201456636261 has 16 divisors (see below), whose sum is σ = 278599934208. Its totient is φ = 129380760000.

The previous prime is 201456636247. The next prime is 201456636263. The reversal of 201456636261 is 162636654102.

201456636261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201456636261 - 2⁶ = 201456636197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201456636263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8973565 + ... + 8995986.

It is an arithmetic number, because the mean of its divisors is an integer number (17412495888).

Almost surely, 2^201456636261 is an apocalyptic number.

It is an amenable number.

201456636261 is a deficient number, since it is larger than the sum of its proper divisors (77143297947).

201456636261 is a wasteful number, since it uses less digits than its factorization.

201456636261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17969692.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 201456636261 in words is "two hundred one billion, four hundred fifty-six million, six hundred thirty-six thousand, two hundred sixty-one".