51616651606 has 48 divisors (see below), whose sum is σ = 90637045200. Its totient is φ = 21959144064.

The previous prime is 51616651601. The next prime is 51616651609. The reversal of 51616651606 is 60615661615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51616651601) 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, 129000 + ... + 346228.

It is an arithmetic number, because the mean of its divisors is an integer number (1888271775).

Almost surely, 2^51616651606 is an apocalyptic number.

51616651606 is a deficient number, since it is larger than the sum of its proper divisors (39020393594).

51616651606 is a wasteful number, since it uses less digits than its factorization.

51616651606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217313 (or 217300 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 51616651606 in words is "fifty-one billion, six hundred sixteen million, six hundred fifty-one thousand, six hundred six".