189867768981 has 32 divisors (see below), whose sum is σ = 294719275008. Its totient is φ = 107449655040.

The previous prime is 189867768977. The next prime is 189867768983.

189867768981 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 189867768981 - 2² = 189867768977 is a prime.

It is a super-2 number, since 2×189867768981² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189867768897 and 189867768906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189867768983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1261215 + ... + 1403708.

It is an arithmetic number, because the mean of its divisors is an integer number (9209977344).

Almost surely, 2^189867768981 is an apocalyptic number.

189867768981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189867768981 is a deficient number, since it is larger than the sum of its proper divisors (104851506027).

189867768981 is a wasteful number, since it uses less digits than its factorization.

189867768981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665081.

The product of its digits is 585252864, while the sum is 78.

The spelling of 189867768981 in words is "one hundred eighty-nine billion, eight hundred sixty-seven million, seven hundred sixty-eight thousand, nine hundred eighty-one".