201916569681 has 12 divisors (see below), whose sum is σ = 292214936208. Its totient is φ = 134353660824.

The previous prime is 201916569667. The next prime is 201916569683. The reversal of 201916569681 is 186965619102.

201916569681 is a `hidden beast` number, since 2 + 0 + 1 + 9 + 16 + 569 + 68 + 1 = 666.

It is not a de Polignac number, because 201916569681 - 2⁵ = 201916569649 is a prime.

It is a super-2 number, since 2×201916569681² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (201916569683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21443835 + ... + 21453248.

It is an arithmetic number, because the mean of its divisors is an integer number (24351244684).

Almost surely, 2^201916569681 is an apocalyptic number.

It is an amenable number.

201916569681 is a deficient number, since it is larger than the sum of its proper divisors (90298366527).

201916569681 is a wasteful number, since it uses less digits than its factorization.

201916569681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42897612 (or 42897609 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 201916569681 in words is "two hundred one billion, nine hundred sixteen million, five hundred sixty-nine thousand, six hundred eighty-one".