661648027927 has 6 divisors (see below), whose sum is σ = 702857940008. Its totient is φ = 622727555424.

The previous prime is 661648027891. The next prime is 661648027981. The reversal of 661648027927 is 729720846166.

It is a happy number.

It is not a de Polignac number, because 661648027927 - 2¹⁵ = 661647995159 is a prime.

It is a super-2 number, since 2×661648027927² (a number of 24 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 (661648027987) 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 in 5 ways as a sum of consecutive naturals, for example, 1144719483 + ... + 1144720060.

Almost surely, 2^661648027927 is an apocalyptic number.

661648027927 is a deficient number, since it is larger than the sum of its proper divisors (41209912081).

661648027927 is a wasteful number, since it uses less digits than its factorization.

661648027927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289439577 (or 2289439560 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 661648027927 in words is "six hundred sixty-one billion, six hundred forty-eight million, twenty-seven thousand, nine hundred twenty-seven".