981661262136 has 32 divisors (see below), whose sum is σ = 2494385178000. Its totient is φ = 321856151040.

The previous prime is 981661262129. The next prime is 981661262173. The reversal of 981661262136 is 631262166189.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 335265361 + ... + 335268288.

Almost surely, 2^981661262136 is an apocalyptic number.

It is an amenable number.

981661262136 is an abundant number, since it is smaller than the sum of its proper divisors (1512723915864).

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

981661262136 is a wasteful number, since it uses less digits than its factorization.

981661262136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670533719 (or 670533715 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The spelling of 981661262136 in words is "nine hundred eighty-one billion, six hundred sixty-one million, two hundred sixty-two thousand, one hundred thirty-six".