67477136621 has 2 divisors, whose sum is σ = 67477136622. Its totient is φ = 67477136620.

The previous prime is 67477136611. The next prime is 67477136633. The reversal of 67477136621 is 12663177476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33814060996 + 33663075625 = 183886^2 + 183475^2 .

It is a cyclic number.

It is not a de Polignac number, because 67477136621 - 2⁶ = 67477136557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67477136621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67477136611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33738568310 + 33738568311.

It is an arithmetic number, because the mean of its divisors is an integer number (33738568311).

Almost surely, 2^67477136621 is an apocalyptic number.

It is an amenable number.

67477136621 is a deficient number, since it is larger than the sum of its proper divisors (1).

67477136621 is an equidigital number, since it uses as much as digits as its factorization.

67477136621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 50.

The spelling of 67477136621 in words is "sixty-seven billion, four hundred seventy-seven million, one hundred thirty-six thousand, six hundred twenty-one".