67475477521 has 2 divisors, whose sum is σ = 67475477522. Its totient is φ = 67475477520.

The previous prime is 67475477519. The next prime is 67475477527. The reversal of 67475477521 is 12577457476.

It is a happy number.

67475477521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63422881921 + 4052595600 = 251839^2 + 63660^2 .

It is a cyclic number.

It is not a de Polignac number, because 67475477521 - 2¹ = 67475477519 is a prime.

Together with 67475477519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67475477527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33737738760 + 33737738761.

It is an arithmetic number, because the mean of its divisors is an integer number (33737738761).

Almost surely, 2^67475477521 is an apocalyptic number.

It is an amenable number.

67475477521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67475477521 is an equidigital number, since it uses as much as digits as its factorization.

67475477521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11524800, while the sum is 55.

The spelling of 67475477521 in words is "sixty-seven billion, four hundred seventy-five million, four hundred seventy-seven thousand, five hundred twenty-one".