2783947505617 has 4 divisors (see below), whose sum is σ = 2786674193716. Its totient is φ = 2781220817520.

The previous prime is 2783947505587. The next prime is 2783947505629. The reversal of 2783947505617 is 7165057493872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2272423591936 + 511523913681 = 1507456^2 + 715209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2783947505617 is a prime.

It is a super-2 number, since 2×2783947505617² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2783947505117) 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, 1363342518 + ... + 1363344559.

It is an arithmetic number, because the mean of its divisors is an integer number (696668548429).

It is a 2-persistent number, because it is pandigital, and so is 2⋅2783947505617 = 5567895011234, but 3⋅2783947505617 = 8351842516851 is not.

Almost surely, 2^{2783947505617} is an apocalyptic number.

It is an amenable number.

2783947505617 is a deficient number, since it is larger than the sum of its proper divisors (2726688099).

2783947505617 is a wasteful number, since it uses less digits than its factorization.

2783947505617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726688098.

The product of its (nonzero) digits is 88905600, while the sum is 64.

The spelling of 2783947505617 in words is "two trillion, seven hundred eighty-three billion, nine hundred forty-seven million, five hundred five thousand, six hundred seventeen".