51660065601 has 16 divisors (see below), whose sum is σ = 76876638720. Its totient is φ = 34285600080.

The previous prime is 51660065591. The next prime is 51660065621. The reversal of 51660065601 is 10656006615.

It is not a de Polignac number, because 51660065601 - 2¹³ = 51660057409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51660065621) 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, 4283970 + ... + 4296011.

It is an arithmetic number, because the mean of its divisors is an integer number (4804789920).

Almost surely, 2^51660065601 is an apocalyptic number.

It is an amenable number.

51660065601 is a deficient number, since it is larger than the sum of its proper divisors (25216573119).

51660065601 is a wasteful number, since it uses less digits than its factorization.

51660065601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580213 (or 8580207 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 51660065601 in words is "fifty-one billion, six hundred sixty million, sixty-five thousand, six hundred one".