67374299521 has 2 divisors, whose sum is σ = 67374299522. Its totient is φ = 67374299520.

The previous prime is 67374299491. The next prime is 67374299563. The reversal of 67374299521 is 12599247376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57938897025 + 9435402496 = 240705^2 + 97136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67374299521 is a prime.

It is not a weakly prime, because it can be changed into another prime (67374294521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33687149760 + 33687149761.

It is an arithmetic number, because the mean of its divisors is an integer number (33687149761).

Almost surely, 2^67374299521 is an apocalyptic number.

It is an amenable number.

67374299521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67374299521 is an equidigital number, since it uses as much as digits as its factorization.

67374299521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 55.

The spelling of 67374299521 in words is "sixty-seven billion, three hundred seventy-four million, two hundred ninety-nine thousand, five hundred twenty-one".