83705953739561 has 4 divisors (see below), whose sum is σ = 83706376786692. Its totient is φ = 83705530692432.

The previous prime is 83705953739549. The next prime is 83705953739657. The reversal of 83705953739561 is 16593735950738.

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 6496605736336 + 77209348003225 = 2548844^2 + 8786885^2 .

It is a cyclic number.

It is not a de Polignac number, because 83705953739561 - 2⁶ = 83705953739497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83705953739501) 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, 211226630 + ... + 211622543.

It is an arithmetic number, because the mean of its divisors is an integer number (20926594196673).

Almost surely, 2^{83705953739561} is an apocalyptic number.

It is an amenable number.

83705953739561 is a deficient number, since it is larger than the sum of its proper divisors (423047131).

83705953739561 is a wasteful number, since it uses less digits than its factorization.

83705953739561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423047130.

The product of its (nonzero) digits is 642978000, while the sum is 71.

The spelling of 83705953739561 in words is "eighty-three trillion, seven hundred five billion, nine hundred fifty-three million, seven hundred thirty-nine thousand, five hundred sixty-one".