661051661434311 has 16 divisors (see below), whose sum is σ = 1060333492025600. Its totient is φ = 357862553558208.

The previous prime is 661051661434253. The next prime is 661051661434313. The reversal of 661051661434311 is 113434166150166.

It is not a de Polignac number, because 661051661434311 - 2¹⁹ = 661051660910023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661051661434313) 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, 828385540246 + ... + 828385541043.

It is an arithmetic number, because the mean of its divisors is an integer number (66270843251600).

Almost surely, 2^{661051661434311} is an apocalyptic number.

661051661434311 is a deficient number, since it is larger than the sum of its proper divisors (399281830591289).

661051661434311 is a wasteful number, since it uses less digits than its factorization.

661051661434311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656771081318.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 661051661434311 in words is "six hundred sixty-one trillion, fifty-one billion, six hundred sixty-one million, four hundred thirty-four thousand, three hundred eleven".