61780612481281 has 4 divisors (see below), whose sum is σ = 63095093597952. Its totient is φ = 60466131364612.

The previous prime is 61780612481267. The next prime is 61780612481293. The reversal of 61780612481281 is 18218421608716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61780612481281 - 2¹³ = 61780612473089 is a prime.

It is a super-2 number, since 2×61780612481281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61780612481221) 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 3 ways as a sum of consecutive naturals, for example, 657240558265 + ... + 657240558358.

It is an arithmetic number, because the mean of its divisors is an integer number (15773773399488).

Almost surely, 2^{61780612481281} is an apocalyptic number.

It is an amenable number.

61780612481281 is a deficient number, since it is larger than the sum of its proper divisors (1314481116671).

61780612481281 is a wasteful number, since it uses less digits than its factorization.

61780612481281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314481116670.

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 61780612481281 in words is "sixty-one trillion, seven hundred eighty billion, six hundred twelve million, four hundred eighty-one thousand, two hundred eighty-one".