82780547417 has 4 divisors (see below), whose sum is σ = 82781122980. Its totient is φ = 82779971856.

The previous prime is 82780547411. The next prime is 82780547431. The reversal of 82780547417 is 71474508728.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8986281616 + 73794265801 = 94796^2 + 271651^2 .

It is a cyclic number.

It is not a de Polignac number, because 82780547417 - 2¹⁶ = 82780481881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82780547411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134723 + ... + 428615.

It is an arithmetic number, because the mean of its divisors is an integer number (20695280745).

Almost surely, 2^82780547417 is an apocalyptic number.

It is an amenable number.

82780547417 is a deficient number, since it is larger than the sum of its proper divisors (575563).

82780547417 is a wasteful number, since it uses less digits than its factorization.

82780547417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575562.

The product of its (nonzero) digits is 3512320, while the sum is 53.

The spelling of 82780547417 in words is "eighty-two billion, seven hundred eighty million, five hundred forty-seven thousand, four hundred seventeen".