981422997566 has 16 divisors (see below), whose sum is σ = 1605980338560. Its totient is φ = 446097075480.

The previous prime is 981422997509. The next prime is 981422997587. The reversal of 981422997566 is 665799224189.

It is a happy number.

It is a super-2 number, since 2×981422997566² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 981422997496 and 981422997505.

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, 3785855 + ... + 4036773.

It is an arithmetic number, because the mean of its divisors is an integer number (100373771160).

Almost surely, 2^981422997566 is an apocalyptic number.

981422997566 is a deficient number, since it is larger than the sum of its proper divisors (624557340994).

981422997566 is a wasteful number, since it uses less digits than its factorization.

981422997566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428719.

The product of its digits is 117573120, while the sum is 68.

The spelling of 981422997566 in words is "nine hundred eighty-one billion, four hundred twenty-two million, nine hundred ninety-seven thousand, five hundred sixty-six".