1383921665604 has 81 divisors (see below), whose sum is σ = 3539600932413. Its totient is φ = 455916947904.

The previous prime is 1383921665597. The next prime is 1383921665611. The reversal of 1383921665604 is 4065661293831.

The square root of 1383921665604 is 1176402.

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

1383921665604 is a `hidden beast` number, since 1 + 3 + 8 + 3 + 9 + 21 + 6 + 6 + 5 + 604 = 666.

It is an interprime number because it is at equal distance from previous prime (1383921665597) and next prime (1383921665611).

It can be written as a sum of positive squares in only one way, i.e., 265742312004 + 1118179353600 = 515502^2 + 1057440^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 628197567 + ... + 628199769.

Almost surely, 2^{1383921665604} is an apocalyptic number.

1383921665604 is the 1176402-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1383921665604

1383921665604 is an abundant number, since it is smaller than the sum of its proper divisors (2155679266809).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1383921665604 is an frugal number, since it uses more digits than its factorization.

1383921665604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594 (or 2297 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 1383921665604 in words is "one trillion, three hundred eighty-three billion, nine hundred twenty-one million, six hundred sixty-five thousand, six hundred four".