51666136233 has 4 divisors (see below), whose sum is σ = 68888181648. Its totient is φ = 34444090820.

The previous prime is 51666136217. The next prime is 51666136261. The reversal of 51666136233 is 33263166615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51666136233 - 2⁴ = 51666136217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51666136633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8611022703 + ... + 8611022708.

It is an arithmetic number, because the mean of its divisors is an integer number (17222045412).

Almost surely, 2^51666136233 is an apocalyptic number.

It is an amenable number.

51666136233 is a deficient number, since it is larger than the sum of its proper divisors (17222045415).

51666136233 is a wasteful number, since it uses less digits than its factorization.

51666136233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17222045414.

The product of its digits is 349920, while the sum is 42.

The spelling of 51666136233 in words is "fifty-one billion, six hundred sixty-six million, one hundred thirty-six thousand, two hundred thirty-three".