978401786825171 has 16 divisors (see below), whose sum is σ = 995768287512576. Its totient is φ = 961078596660000.

The previous prime is 978401786825137. The next prime is 978401786825179. The reversal of 978401786825171 is 171528687104879.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978401786825171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978401786825179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233040266 + ... + 237201536.

It is an arithmetic number, because the mean of its divisors is an integer number (62235517969536).

Almost surely, 2^{978401786825171} is an apocalyptic number.

978401786825171 is a deficient number, since it is larger than the sum of its proper divisors (17366500687405).

978401786825171 is a wasteful number, since it uses less digits than its factorization.

978401786825171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166474.

The product of its (nonzero) digits is 379330560, while the sum is 74.

The spelling of 978401786825171 in words is "nine hundred seventy-eight trillion, four hundred one billion, seven hundred eighty-six million, eight hundred twenty-five thousand, one hundred seventy-one".