84538802378417 has 4 divisors (see below), whose sum is σ = 86133874121460. Its totient is φ = 82943730635376.

The previous prime is 84538802378339. The next prime is 84538802378423. The reversal of 84538802378417 is 71487320883548.

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 46747796119696 + 37791006258721 = 6837236^2 + 6147439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84538802378417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84538802378467) 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, 797535871442 + ... + 797535871547.

It is an arithmetic number, because the mean of its divisors is an integer number (21533468530365).

Almost surely, 2^{84538802378417} is an apocalyptic number.

It is an amenable number.

84538802378417 is a deficient number, since it is larger than the sum of its proper divisors (1595071743043).

84538802378417 is a wasteful number, since it uses less digits than its factorization.

84538802378417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595071743042.

The product of its (nonzero) digits is 289013760, while the sum is 68.

The spelling of 84538802378417 in words is "eighty-four trillion, five hundred thirty-eight billion, eight hundred two million, three hundred seventy-eight thousand, four hundred seventeen".