51651101656606 has 4 divisors (see below), whose sum is σ = 77476652484912. Its totient is φ = 25825550828302.

The previous prime is 51651101656571. The next prime is 51651101656619. The reversal of 51651101656606 is 60665610115615.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51651101656606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12912775414150 + ... + 12912775414153.

It is an arithmetic number, because the mean of its divisors is an integer number (19369163121228).

Almost surely, 2^{51651101656606} is an apocalyptic number.

51651101656606 is a deficient number, since it is larger than the sum of its proper divisors (25825550828306).

51651101656606 is a wasteful number, since it uses less digits than its factorization.

51651101656606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25825550828305.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 51651101656606 in words is "fifty-one trillion, six hundred fifty-one billion, one hundred one million, six hundred fifty-six thousand, six hundred six".