61306565321 has 32 divisors (see below), whose sum is σ = 65709294336. Its totient is φ = 57125376000.

The previous prime is 61306565303. The next prime is 61306565351. The reversal of 61306565321 is 12356560316.

It is a cyclic number.

It is not a de Polignac number, because 61306565321 - 2²⁶ = 61239456457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61306565351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11894681 + ... + 11899833.

It is an arithmetic number, because the mean of its divisors is an integer number (2053415448).

Almost surely, 2^61306565321 is an apocalyptic number.

61306565321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

61306565321 is a deficient number, since it is larger than the sum of its proper divisors (4402729015).

61306565321 is a wasteful number, since it uses less digits than its factorization.

61306565321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5393.

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 61306565321 in words is "sixty-one billion, three hundred six million, five hundred sixty-five thousand, three hundred twenty-one".