83771984086561 has 8 divisors (see below), whose sum is σ = 84020905539584. Its totient is φ = 83523064645440.

The previous prime is 83771984086519. The next prime is 83771984086597. The reversal of 83771984086561 is 16568048917738.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83771984086561 - 2¹⁹ = 83771983562273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83771981086561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147235456 + ... + 147803326.

It is an arithmetic number, because the mean of its divisors is an integer number (10502613192448).

Almost surely, 2^{83771984086561} is an apocalyptic number.

It is an amenable number.

83771984086561 is a deficient number, since it is larger than the sum of its proper divisors (248921453023).

83771984086561 is a wasteful number, since it uses less digits than its factorization.

83771984086561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005951.

The product of its (nonzero) digits is 487710720, while the sum is 73.

The spelling of 83771984086561 in words is "eighty-three trillion, seven hundred seventy-one billion, nine hundred eighty-four million, eighty-six thousand, five hundred sixty-one".