201111605651 has 16 divisors (see below), whose sum is σ = 224242560000. Its totient is φ = 178794919680.

The previous prime is 201111605621. The next prime is 201111605659. The reversal of 201111605651 is 156506111102.

It is a cyclic number.

It is not a de Polignac number, because 201111605651 - 2²² = 201107411347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201111605659) 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, 490010 + ... + 801456.

It is an arithmetic number, because the mean of its divisors is an integer number (14015160000).

Almost surely, 2^201111605651 is an apocalyptic number.

201111605651 is a deficient number, since it is larger than the sum of its proper divisors (23130954349).

201111605651 is a wasteful number, since it uses less digits than its factorization.

201111605651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312754.

The product of its (nonzero) digits is 1800, while the sum is 29.

Adding to 201111605651 its reverse (156506111102), we get a palindrome (357617716753).

The spelling of 201111605651 in words is "two hundred one billion, one hundred eleven million, six hundred five thousand, six hundred fifty-one".