978251997894 has 8 divisors (see below), whose sum is σ = 1956503995800. Its totient is φ = 326083999296.

The previous prime is 978251997889. The next prime is 978251997917. The reversal of 978251997894 is 498799152879.

978251997894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

978251997894 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81520999819 + ... + 81520999830.

It is an arithmetic number, because the mean of its divisors is an integer number (244562999475).

Almost surely, 2^978251997894 is an apocalyptic number.

978251997894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978251997894 is a wasteful number, since it uses less digits than its factorization.

978251997894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163041999654.

The product of its digits is 823011840, while the sum is 78.

The spelling of 978251997894 in words is "nine hundred seventy-eight billion, two hundred fifty-one million, nine hundred ninety-seven thousand, eight hundred ninety-four".