17978519056 has 15 divisors (see below), whose sum is σ = 34834419853. Its totient is φ = 8988991360.

The previous prime is 17978519023. The next prime is 17978519071. The reversal of 17978519056 is 65091587971.

The square root of 17978519056 is 134084.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5000752656 + 12977766400 = 70716^2 + 113920^2 .

It is a super-2 number, since 2×17978519056² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 519576 + ... + 553096.

Almost surely, 2^17978519056 is an apocalyptic number.

17978519056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

17978519056 is the 134084-th square number.

It is an amenable number.

17978519056 is a deficient number, since it is larger than the sum of its proper divisors (16855900797).

17978519056 is an frugal number, since it uses more digits than its factorization.

17978519056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67050 (or 33523 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 58.

The spelling of 17978519056 in words is "seventeen billion, nine hundred seventy-eight million, five hundred nineteen thousand, fifty-six".