981287605504 has 18 divisors (see below), whose sum is σ = 1958742056810. Its totient is φ = 490643802624.

The previous prime is 981287605481. The next prime is 981287605541. The reversal of 981287605504 is 405506782189.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 885405721600 + 95881883904 = 940960^2 + 309648^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1916577099 + ... + 1916577610.

Almost surely, 2^981287605504 is an apocalyptic number.

It is an amenable number.

981287605504 is a deficient number, since it is larger than the sum of its proper divisors (977454451306).

981287605504 is an equidigital number, since it uses as much as digits as its factorization.

981287605504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833154725 (or 3833154711 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 981287605504 in words is "nine hundred eighty-one billion, two hundred eighty-seven million, six hundred five thousand, five hundred four".