1386645198481 has 27 divisors (see below), whose sum is σ = 1427318099569. Its totient is φ = 1347127496000.

The previous prime is 1386645198431. The next prime is 1386645198487. The reversal of 1386645198481 is 1848915466831.

The square root of 1386645198481 is 1177559.

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 87729108481 + 1298916090000 = 296191^2 + 1139700^2 .

It is not a de Polignac number, because 1386645198481 - 2⁹ = 1386645197969 is a prime.

It is a super-2 number, since 2×1386645198481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386645198487) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10585077786 + ... + 10585077916.

Almost surely, 2^{1386645198481} is an apocalyptic number.

1386645198481 is the 1177559-th square number.

1386645198481 is the 588780-th centered octagonal number.

It is an amenable number.

1386645198481 is a deficient number, since it is larger than the sum of its proper divisors (40672901088).

1386645198481 is an frugal number, since it uses more digits than its factorization.

1386645198481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 321 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 64.

Multiplying 1386645198481 by its sum of digits (64), we get a square (88745292702784 = 9420472²).

The spelling of 1386645198481 in words is "one trillion, three hundred eighty-six billion, six hundred forty-five million, one hundred ninety-eight thousand, four hundred eighty-one".