61580321281 has 16 divisors (see below), whose sum is σ = 63407897280. Its totient is φ = 59781611520.

The previous prime is 61580321249. The next prime is 61580321293. The reversal of 61580321281 is 18212308516.

It is a cyclic number.

It is not a de Polignac number, because 61580321281 - 2⁵ = 61580321249 is a prime.

It is a super-2 number, since 2×61580321281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61580321281.

It is not an unprimeable number, because it can be changed into a prime (61580321681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2661121 + ... + 2684161.

It is an arithmetic number, because the mean of its divisors is an integer number (3962993580).

Almost surely, 2^61580321281 is an apocalyptic number.

It is an amenable number.

61580321281 is a deficient number, since it is larger than the sum of its proper divisors (1827575999).

61580321281 is a wasteful number, since it uses less digits than its factorization.

61580321281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23664.

The product of its (nonzero) digits is 23040, while the sum is 37.

Adding to 61580321281 its reverse (18212308516), we get a palindrome (79792629797).

The spelling of 61580321281 in words is "sixty-one billion, five hundred eighty million, three hundred twenty-one thousand, two hundred eighty-one".