978251997904 has 10 divisors (see below), whose sum is σ = 1895363245970. Its totient is φ = 489125998944.

The previous prime is 978251997889. The next prime is 978251997917. The reversal of 978251997904 is 409799152879.

It can be written as a sum of positive squares in only one way, i.e., 945266173504 + 32985824400 = 972248^2 + 181620^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30570374919 + ... + 30570374950.

It is an arithmetic number, because the mean of its divisors is an integer number (189536324597).

Almost surely, 2^978251997904 is an apocalyptic number.

It is an amenable number.

978251997904 is a deficient number, since it is larger than the sum of its proper divisors (917111248066).

978251997904 is a wasteful number, since it uses less digits than its factorization.

978251997904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61140749877 (or 61140749871 counting only the distinct ones).

The product of its (nonzero) digits is 102876480, while the sum is 70.

The spelling of 978251997904 in words is "nine hundred seventy-eight billion, two hundred fifty-one million, nine hundred ninety-seven thousand, nine hundred four".