51521920067 has 2 divisors, whose sum is σ = 51521920068. Its totient is φ = 51521920066.

The previous prime is 51521920049. The next prime is 51521920069. The reversal of 51521920067 is 76002912515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51521920067 - 2⁶ = 51521920003 is a prime.

Together with 51521920069, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51521920067.

It is not a weakly prime, because it can be changed into another prime (51521920069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760960033 + 25760960034.

It is an arithmetic number, because the mean of its divisors is an integer number (25760960034).

Almost surely, 2^51521920067 is an apocalyptic number.

51521920067 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521920067 is an equidigital number, since it uses as much as digits as its factorization.

51521920067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 51521920067 in words is "fifty-one billion, five hundred twenty-one million, nine hundred twenty thousand, sixty-seven".