65166055550 has 12 divisors (see below), whose sum is σ = 121208863416. Its totient is φ = 26066422200.

The previous prime is 65166055547. The next prime is 65166055583. The reversal of 65166055550 is 5555066156.

It is a super-2 number, since 2×65166055550² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 651660506 + ... + 651660605.

It is an arithmetic number, because the mean of its divisors is an integer number (10100738618).

Almost surely, 2^65166055550 is an apocalyptic number.

65166055550 is a deficient number, since it is larger than the sum of its proper divisors (56042807866).

65166055550 is a wasteful number, since it uses less digits than its factorization.

65166055550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303321123 (or 1303321118 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 44.

The spelling of 65166055550 in words is "sixty-five billion, one hundred sixty-six million, fifty-five thousand, five hundred fifty".