661060111051 has 2 divisors, whose sum is σ = 661060111052. Its totient is φ = 661060111050.

The previous prime is 661060111039. The next prime is 661060111069. The reversal of 661060111051 is 150111060166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661060111051 - 2¹⁹ = 661059586763 is a prime.

It is not a weakly prime, because it can be changed into another prime (661060111021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330530055525 + 330530055526.

It is an arithmetic number, because the mean of its divisors is an integer number (330530055526).

Almost surely, 2^661060111051 is an apocalyptic number.

661060111051 is a deficient number, since it is larger than the sum of its proper divisors (1).

661060111051 is an equidigital number, since it uses as much as digits as its factorization.

661060111051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

The spelling of 661060111051 in words is "six hundred sixty-one billion, sixty million, one hundred eleven thousand, fifty-one".