51656666606 has 8 divisors (see below), whose sum is σ = 77485966824. Its totient is φ = 25828011000.

The previous prime is 51656666587. The next prime is 51656666627. The reversal of 51656666606 is 60666665615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×51656666606³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211976 + ... + 385028.

It is an arithmetic number, because the mean of its divisors is an integer number (9685745853).

Almost surely, 2^51656666606 is an apocalyptic number.

51656666606 is a deficient number, since it is larger than the sum of its proper divisors (25829300218).

51656666606 is a wasteful number, since it uses less digits than its factorization.

51656666606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322306.

The product of its (nonzero) digits is 6998400, while the sum is 53.

Subtracting 51656666606 from its reverse (60666665615), we obtain a palindrome (9009999009).

The spelling of 51656666606 in words is "fifty-one billion, six hundred fifty-six million, six hundred sixty-six thousand, six hundred six".