61674067521 has 72 divisors (see below), whose sum is σ = 102102253344. Its totient is φ = 36895098240.

The previous prime is 61674067517. The next prime is 61674067523. The reversal of 61674067521 is 12576047616.

61674067521 is a `hidden beast` number, since 6 + 1 + 67 + 4 + 0 + 67 + 521 = 666.

It is not a de Polignac number, because 61674067521 - 2² = 61674067517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61674067523) 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 in 71 ways as a sum of consecutive naturals, for example, 16680345 + ... + 16684041.

It is an arithmetic number, because the mean of its divisors is an integer number (1418086852).

Almost surely, 2^61674067521 is an apocalyptic number.

It is an amenable number.

61674067521 is a deficient number, since it is larger than the sum of its proper divisors (40428185823).

61674067521 is an equidigital number, since it uses as much as digits as its factorization.

61674067521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881 (or 3790 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 61674067521 in words is "sixty-one billion, six hundred seventy-four million, sixty-seven thousand, five hundred twenty-one".