83711868037561 has 3 divisors (see below), whose sum is σ = 83711877186981. Its totient is φ = 83711858888142.

The previous prime is 83711868037541. The next prime is 83711868037631. The reversal of 83711868037561 is 16573086811738.

The square root of 83711868037561 is 9149419.

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 is not a de Polignac number, because 83711868037561 - 2¹⁹ = 83711867513273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83711868037493 and 83711868037502.

It is not an unprimeable number, because it can be changed into a prime (83711868037541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4574710 + ... + 13724128.

It is an arithmetic number, because the mean of its divisors is an integer number (27903959062327).

Almost surely, 2^{83711868037561} is an apocalyptic number.

83711868037561 is the 9149419-th square number.

83711868037561 is the 4574710-th centered octagonal number.

It is an amenable number.

83711868037561 is a deficient number, since it is larger than the sum of its proper divisors (9149420).

83711868037561 is an frugal number, since it uses more digits than its factorization.

83711868037561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18298838 (or 9149419 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 64.

The spelling of 83711868037561 in words is "eighty-three trillion, seven hundred eleven billion, eight hundred sixty-eight million, thirty-seven thousand, five hundred sixty-one".