51698908667 has 32 divisors (see below), whose sum is σ = 62776934400. Its totient is φ = 41588715168.

The previous prime is 51698908627. The next prime is 51698908669. The reversal of 51698908667 is 76680989615.

It is not a de Polignac number, because 51698908667 - 2⁸ = 51698908411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51698908669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13899434 + ... + 13903152.

It is an arithmetic number, because the mean of its divisors is an integer number (1961779200).

Almost surely, 2^51698908667 is an apocalyptic number.

51698908667 is a deficient number, since it is larger than the sum of its proper divisors (11078025733).

51698908667 is a wasteful number, since it uses less digits than its factorization.

51698908667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 51698908667 in words is "fifty-one billion, six hundred ninety-eight million, nine hundred eight thousand, six hundred sixty-seven".