981165833666 has 4 divisors (see below), whose sum is σ = 1471748750502. Its totient is φ = 490582916832.

The previous prime is 981165833657. The next prime is 981165833677. The reversal of 981165833666 is 666338561189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 954148008025 + 27017825641 = 976805^2 + 164371^2 .

It is a junction number, because it is equal to n+sod(n) for n = 981165833599 and 981165833608.

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, 245291458415 + ... + 245291458418.

Almost surely, 2^981165833666 is an apocalyptic number.

981165833666 is a deficient number, since it is larger than the sum of its proper divisors (490582916836).

981165833666 is a wasteful number, since it uses less digits than its factorization.

981165833666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490582916835.

The product of its digits is 33592320, while the sum is 62.

The spelling of 981165833666 in words is "nine hundred eighty-one billion, one hundred sixty-five million, eight hundred thirty-three thousand, six hundred sixty-six".