661051653111 has 12 divisors (see below), whose sum is σ = 1005107776920. Its totient is φ = 417506307120.

The previous prime is 661051653109. The next prime is 661051653161. The reversal of 661051653111 is 111356150166.

661051653111 is a `hidden beast` number, since 6 + 6 + 105 + 1 + 6 + 531 + 11 = 666.

It is not a de Polignac number, because 661051653111 - 2¹ = 661051653109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661051653161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1932899400 + ... + 1932899741.

It is an arithmetic number, because the mean of its divisors is an integer number (83758981410).

Almost surely, 2^661051653111 is an apocalyptic number.

661051653111 is a deficient number, since it is larger than the sum of its proper divisors (344056123809).

661051653111 is a wasteful number, since it uses less digits than its factorization.

661051653111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865799166 (or 3865799163 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 661051653111 in words is "six hundred sixty-one billion, fifty-one million, six hundred fifty-three thousand, one hundred eleven".