53975981987 has 2 divisors, whose sum is σ = 53975981988. Its totient is φ = 53975981986.

The previous prime is 53975981977. The next prime is 53975981989. The reversal of 53975981987 is 78918957935.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53975981987 is a prime.

Together with 53975981989, 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 53975981987.

It is not a weakly prime, because it can be changed into another prime (53975981989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26987990993 + 26987990994.

It is an arithmetic number, because the mean of its divisors is an integer number (26987990994).

Almost surely, 2^53975981987 is an apocalyptic number.

53975981987 is a deficient number, since it is larger than the sum of its proper divisors (1).

53975981987 is an equidigital number, since it uses as much as digits as its factorization.

53975981987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 171460800, while the sum is 71.

The spelling of 53975981987 in words is "fifty-three billion, nine hundred seventy-five million, nine hundred eighty-one thousand, nine hundred eighty-seven".