51660505611 has 24 divisors (see below), whose sum is σ = 87666314736. Its totient is φ = 28900981440.

The previous prime is 51660505609. The next prime is 51660505649. The reversal of 51660505611 is 11650506615.

It is not a de Polignac number, because 51660505611 - 2¹ = 51660505609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51660505651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20068840 + ... + 20071413.

It is an arithmetic number, because the mean of its divisors is an integer number (3652763114).

Almost surely, 2^51660505611 is an apocalyptic number.

51660505611 is a deficient number, since it is larger than the sum of its proper divisors (36005809125).

51660505611 is a wasteful number, since it uses less digits than its factorization.

51660505611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40140283 (or 40140280 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51660505611 in words is "fifty-one billion, six hundred sixty million, five hundred five thousand, six hundred eleven".