661060051117 has 2 divisors, whose sum is σ = 661060051118. Its totient is φ = 661060051116.

The previous prime is 661060051009. The next prime is 661060051129. The reversal of 661060051117 is 711150060166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381545877636 + 279514173481 = 617694^2 + 528691^2 .

It is a cyclic number.

It is not a de Polignac number, because 661060051117 - 2²⁷ = 660925833389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661060051177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330530025558 + 330530025559.

It is an arithmetic number, because the mean of its divisors is an integer number (330530025559).

Almost surely, 2^661060051117 is an apocalyptic number.

It is an amenable number.

661060051117 is a deficient number, since it is larger than the sum of its proper divisors (1).

661060051117 is an equidigital number, since it uses as much as digits as its factorization.

661060051117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 661060051117 in words is "six hundred sixty-one billion, sixty million, fifty-one thousand, one hundred seventeen".