201561268849 has 8 divisors (see below), whose sum is σ = 211623773760. Its totient is φ = 191706238416.

The previous prime is 201561268837. The next prime is 201561268861. The reversal of 201561268849 is 948862165102.

It is an interprime number because it is at equal distance from previous prime (201561268837) and next prime (201561268861).

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

It is a cyclic number.

It is not a de Polignac number, because 201561268849 - 2⁷ = 201561268721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201561268796 and 201561268805.

It is not an unprimeable number, because it can be changed into a prime (201561268829) 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, 51866629 + ... + 51870514.

It is an arithmetic number, because the mean of its divisors is an integer number (26452971720).

Almost surely, 2^201561268849 is an apocalyptic number.

201561268849 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

201561268849 is a deficient number, since it is larger than the sum of its proper divisors (10062504911).

201561268849 is a wasteful number, since it uses less digits than its factorization.

201561268849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103737239.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 201561268849 in words is "two hundred one billion, five hundred sixty-one million, two hundred sixty-eight thousand, eight hundred forty-nine".