981438777522 has 48 divisors (see below), whose sum is σ = 2431315461120. Its totient is φ = 280285759296.

The previous prime is 981438777511. The next prime is 981438777547. The reversal of 981438777522 is 225777834189.

981438777522 is a `hidden beast` number, since 9 + 8 + 1 + 4 + 38 + 7 + 77 + 522 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 981438777522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1457323 + ... + 2021550.

It is an arithmetic number, because the mean of its divisors is an integer number (50652405440).

Almost surely, 2^981438777522 is an apocalyptic number.

981438777522 is an abundant number, since it is smaller than the sum of its proper divisors (1449876683598).

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

981438777522 is a wasteful number, since it uses less digits than its factorization.

981438777522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481127 (or 3481124 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 63.

The spelling of 981438777522 in words is "nine hundred eighty-one billion, four hundred thirty-eight million, seven hundred seventy-seven thousand, five hundred twenty-two".