67910045521 has 2 divisors, whose sum is σ = 67910045522. Its totient is φ = 67910045520.

The previous prime is 67910045509. The next prime is 67910045557. The reversal of 67910045521 is 12554001976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57044067921 + 10865977600 = 238839^2 + 104240^2 .

It is a cyclic number.

It is not a de Polignac number, because 67910045521 - 2²¹ = 67907948369 is a prime.

It is a super-2 number, since 2×67910045521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67910345521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33955022760 + 33955022761.

It is an arithmetic number, because the mean of its divisors is an integer number (33955022761).

Almost surely, 2^67910045521 is an apocalyptic number.

It is an amenable number.

67910045521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67910045521 is an equidigital number, since it uses as much as digits as its factorization.

67910045521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 67910045521 in words is "sixty-seven billion, nine hundred ten million, forty-five thousand, five hundred twenty-one".