661051663330231 has 12 divisors (see below), whose sum is σ = 684038203567992. Its totient is φ = 638814822870000.

The previous prime is 661051663330211. The next prime is 661051663330241. The reversal of 661051663330231 is 132033366150166.

661051663330231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661051663330231 - 2⁷ = 661051663330103 is a prime.

It is a super-2 number, since 2×661051663330231² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661051663330211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 489967525 + ... + 491314846.

It is an arithmetic number, because the mean of its divisors is an integer number (57003183630666).

Almost surely, 2^{661051663330231} is an apocalyptic number.

661051663330231 is a deficient number, since it is larger than the sum of its proper divisors (22986540237761).

661051663330231 is an equidigital number, since it uses as much as digits as its factorization.

661051663330231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981283134 (or 981283103 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 46.

The spelling of 661051663330231 in words is "six hundred sixty-one trillion, fifty-one billion, six hundred sixty-three million, three hundred thirty thousand, two hundred thirty-one".