17979045381 has 12 divisors (see below), whose sum is σ = 28330617120. Its totient is φ = 10896391080.

The previous prime is 17979045367. The next prime is 17979045401. The reversal of 17979045381 is 18354097971.

It is a happy number.

17979045381 is a `hidden beast` number, since 17 + 9 + 7 + 90 + 4 + 538 + 1 = 666.

It is not a de Polignac number, because 17979045381 - 2¹⁷ = 17978914309 is a prime.

It is a super-2 number, since 2×17979045381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17979035381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90803161 + ... + 90803358.

It is an arithmetic number, because the mean of its divisors is an integer number (2360884760).

Almost surely, 2^17979045381 is an apocalyptic number.

17979045381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17979045381 is a deficient number, since it is larger than the sum of its proper divisors (10351571739).

17979045381 is a wasteful number, since it uses less digits than its factorization.

17979045381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181606536 (or 181606533 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 17979045381 in words is "seventeen billion, nine hundred seventy-nine million, forty-five thousand, three hundred eighty-one".