1377380387665 has 24 divisors (see below), whose sum is σ = 1788111626472. Its totient is φ = 1015020602880.

The previous prime is 1377380387629. The next prime is 1377380387671. The reversal of 1377380387665 is 5667830837731.

It can be written as a sum of positive squares in 4 ways, for example, as 735896328336 + 641484059329 = 857844^2 + 800927^2 .

It is not a de Polignac number, because 1377380387665 - 2¹¹ = 1377380385617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1377380387597 and 1377380387606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3480066 + ... + 3855595.

It is an arithmetic number, because the mean of its divisors is an integer number (74504651103).

Almost surely, 2^{1377380387665} is an apocalyptic number.

It is an amenable number.

1377380387665 is a deficient number, since it is larger than the sum of its proper divisors (410731238807).

1377380387665 is an equidigital number, since it uses as much as digits as its factorization.

1377380387665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7335777 (or 7335730 counting only the distinct ones).

The product of its (nonzero) digits is 106686720, while the sum is 64.

The spelling of 1377380387665 in words is "one trillion, three hundred seventy-seven billion, three hundred eighty million, three hundred eighty-seven thousand, six hundred sixty-five".