661074548319 has 12 divisors (see below), whose sum is σ = 955191650400. Its totient is φ = 440575046304.

The previous prime is 661074548177. The next prime is 661074548359. The reversal of 661074548319 is 913845470166.

661074548319 is a `hidden beast` number, since 6 + 6 + 10 + 74 + 548 + 3 + 19 = 666.

It is not a de Polignac number, because 661074548319 - 2²¹ = 661072451167 is a prime.

It is a super-2 number, since 2×661074548319² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661074548359) 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 in 11 ways as a sum of consecutive naturals, for example, 11746974 + ... + 11803115.

It is an arithmetic number, because the mean of its divisors is an integer number (79599304200).

Almost surely, 2^661074548319 is an apocalyptic number.

661074548319 is a deficient number, since it is larger than the sum of its proper divisors (294117102081).

661074548319 is a wasteful number, since it uses less digits than its factorization.

661074548319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23553214 (or 23553211 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 661074548319 in words is "six hundred sixty-one billion, seventy-four million, five hundred forty-eight thousand, three hundred nineteen".