83705902722649 has 3 divisors (see below), whose sum is σ = 83705911871743. Its totient is φ = 83705893573556.

The previous prime is 83705902722647. The next prime is 83705902722683. The reversal of 83705902722649 is 94622720950738.

The square root of 83705902722649 is 9149093.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 7989243575625 + 75716659147024 = 2826525^2 + 8701532^2 .

It is not a de Polignac number, because 83705902722649 - 2¹ = 83705902722647 is a prime.

It is a super-3 number, since 3×83705902722649³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83705902722641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4574547 + ... + 13723639.

Almost surely, 2^{83705902722649} is an apocalyptic number.

83705902722649 is the 9149093-rd square number.

83705902722649 is the 4574547-th centered octagonal number.

It is an amenable number.

83705902722649 is a deficient number, since it is larger than the sum of its proper divisors (9149094).

83705902722649 is an frugal number, since it uses more digits than its factorization.

83705902722649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18298186 (or 9149093 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 64.

The spelling of 83705902722649 in words is "eighty-three trillion, seven hundred five billion, nine hundred two million, seven hundred twenty-two thousand, six hundred forty-nine".