978854217897 has 32 divisors (see below), whose sum is σ = 1412645971968. Its totient is φ = 601328762496.

The previous prime is 978854217883. The next prime is 978854217899. The reversal of 978854217897 is 798712458879.

It is not a de Polignac number, because 978854217897 - 2⁴ = 978854217881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (978854217899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2043093 + ... + 2476274.

It is an arithmetic number, because the mean of its divisors is an integer number (44145186624).

Almost surely, 2^978854217897 is an apocalyptic number.

It is an amenable number.

978854217897 is a deficient number, since it is larger than the sum of its proper divisors (433791754071).

978854217897 is a wasteful number, since it uses less digits than its factorization.

978854217897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519509.

The product of its digits is 568995840, while the sum is 75.

The spelling of 978854217897 in words is "nine hundred seventy-eight billion, eight hundred fifty-four million, two hundred seventeen thousand, eight hundred ninety-seven".