61604506321 has 2 divisors, whose sum is σ = 61604506322. Its totient is φ = 61604506320.

The previous prime is 61604506259. The next prime is 61604506349. The reversal of 61604506321 is 12360540616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30896850625 + 30707655696 = 175775^2 + 175236^2 .

It is a cyclic number.

It is not a de Polignac number, because 61604506321 - 2²⁵ = 61570951889 is a prime.

It is not a weakly prime, because it can be changed into another prime (61604506361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802253160 + 30802253161.

It is an arithmetic number, because the mean of its divisors is an integer number (30802253161).

Almost surely, 2^61604506321 is an apocalyptic number.

It is an amenable number.

61604506321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61604506321 is an equidigital number, since it uses as much as digits as its factorization.

61604506321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 61604506321 in words is "sixty-one billion, six hundred four million, five hundred six thousand, three hundred twenty-one".