83974078175521 has 2 divisors, whose sum is σ = 83974078175522. Its totient is φ = 83974078175520.

The previous prime is 83974078175501. The next prime is 83974078175569. The reversal of 83974078175521 is 12557187047938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59817246373921 + 24156831801600 = 7734161^2 + 4914960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83974078175521 is a prime.

It is not a weakly prime, because it can be changed into another prime (83974078175501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41987039087760 + 41987039087761.

It is an arithmetic number, because the mean of its divisors is an integer number (41987039087761).

Almost surely, 2^{83974078175521} is an apocalyptic number.

It is an amenable number.

83974078175521 is a deficient number, since it is larger than the sum of its proper divisors (1).

83974078175521 is an equidigital number, since it uses as much as digits as its factorization.

83974078175521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118540800, while the sum is 67.

The spelling of 83974078175521 in words is "eighty-three trillion, nine hundred seventy-four billion, seventy-eight million, one hundred seventy-five thousand, five hundred twenty-one".