19413963556 has 81 divisors (see below), whose sum is σ = 38623711539. Its totient is φ = 8533928832.

The previous prime is 19413963523. The next prime is 19413963557. The reversal of 19413963556 is 65536931491.

It is a happy number.

The square root of 19413963556 is 139334.

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

It can be written as a sum of positive squares in 4 ways, for example, as 8220323556 + 11193640000 = 90666^2 + 105800^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19413963557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 83321616 + ... + 83321848.

Almost surely, 2^19413963556 is an apocalyptic number.

19413963556 is the 139334-th square number.

It is an amenable number.

19413963556 is a deficient number, since it is larger than the sum of its proper divisors (19209747983).

19413963556 is a wasteful number, since it uses less digits than its factorization.

19413963556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 271 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 52.

The spelling of 19413963556 in words is "nineteen billion, four hundred thirteen million, nine hundred sixty-three thousand, five hundred fifty-six".