51510666667 has 4 divisors (see below), whose sum is σ = 51511140000. Its totient is φ = 51510193336.

The previous prime is 51510666659. The next prime is 51510666671. The reversal of 51510666667 is 76666601515.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51510666667 - 2³ = 51510666659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51510666667.

It is not an unprimeable number, because it can be changed into a prime (51510666367) 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, 17709 + ... + 321457.

It is an arithmetic number, because the mean of its divisors is an integer number (12877785000).

Almost surely, 2^51510666667 is an apocalyptic number.

51510666667 is a deficient number, since it is larger than the sum of its proper divisors (473333).

51510666667 is a wasteful number, since it uses less digits than its factorization.

51510666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473332.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 51510666667 in words is "fifty-one billion, five hundred ten million, six hundred sixty-six thousand, six hundred sixty-seven".