17981660463 has 8 divisors (see below), whose sum is σ = 25819820208. Its totient is φ = 11065637184.

The previous prime is 17981660443. The next prime is 17981660467. The reversal of 17981660463 is 36406618971.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 17981660463 - 2⁶ = 17981660399 is a prime.

It is a super-2 number, since 2×17981660463² (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 (17981660467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230534070 + ... + 230534147.

It is an arithmetic number, because the mean of its divisors is an integer number (3227477526).

Almost surely, 2^17981660463 is an apocalyptic number.

17981660463 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

17981660463 is a deficient number, since it is larger than the sum of its proper divisors (7838159745).

17981660463 is a wasteful number, since it uses less digits than its factorization.

17981660463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461068233.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 17981660463 in words is "seventeen billion, nine hundred eighty-one million, six hundred sixty thousand, four hundred sixty-three".