61780612473089 has 2 divisors, whose sum is σ = 61780612473090. Its totient is φ = 61780612473088.

The previous prime is 61780612473071. The next prime is 61780612473091. The reversal of 61780612473089 is 98037421608716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38661248245489 + 23119364227600 = 6217817^2 + 4808260^2 .

It is a cyclic number.

It is not a de Polignac number, because 61780612473089 - 2²⁰ = 61780611424513 is a prime.

It is a super-3 number, since 3×61780612473089³ (a number of 42 digits) contains 333 as substring.

Together with 61780612473091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61780612473389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30890306236544 + 30890306236545.

It is an arithmetic number, because the mean of its divisors is an integer number (30890306236545).

Almost surely, 2^{61780612473089} is an apocalyptic number.

It is an amenable number.

61780612473089 is a deficient number, since it is larger than the sum of its proper divisors (1).

61780612473089 is an equidigital number, since it uses as much as digits as its factorization.

61780612473089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 61780612473089 in words is "sixty-one trillion, seven hundred eighty billion, six hundred twelve million, four hundred seventy-three thousand, eighty-nine".