201961313766 has 32 divisors (see below), whose sum is σ = 455124096000. Its totient is φ = 66372261480.

The previous prime is 201961313761. The next prime is 201961313779. The reversal of 201961313766 is 667313169102.

It is a happy number.

201961313766 is a `hidden beast` number, since 2 + 0 + 19 + 613 + 13 + 7 + 6 + 6 = 666.

It is a super-2 number, since 2×201961313766² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201961313761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26334366 + ... + 26342033.

It is an arithmetic number, because the mean of its divisors is an integer number (14222628000).

Almost surely, 2^201961313766 is an apocalyptic number.

201961313766 is an abundant number, since it is smaller than the sum of its proper divisors (253162782234).

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

201961313766 is a wasteful number, since it uses less digits than its factorization.

201961313766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52676481 (or 52676475 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 201961313766 in words is "two hundred one billion, nine hundred sixty-one million, three hundred thirteen thousand, seven hundred sixty-six".