1377335206505 has 8 divisors (see below), whose sum is σ = 1657233355272. Its totient is φ = 1098914093568.

The previous prime is 1377335206439. The next prime is 1377335206517. The reversal of 1377335206505 is 5056025337731.

It can be written as a sum of positive squares in 4 ways, for example, as 377599189081 + 999736017424 = 614491^2 + 999868^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1377335206505 - 2¹⁰ = 1377335205481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1377335206505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369256904 + ... + 369260633.

It is an arithmetic number, because the mean of its divisors is an integer number (207154169409).

Almost surely, 2^{1377335206505} is an apocalyptic number.

It is an amenable number.

1377335206505 is a deficient number, since it is larger than the sum of its proper divisors (279898148767).

1377335206505 is an equidigital number, since it uses as much as digits as its factorization.

1377335206505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738517915.

The product of its (nonzero) digits is 1984500, while the sum is 47.

The spelling of 1377335206505 in words is "one trillion, three hundred seventy-seven billion, three hundred thirty-five million, two hundred six thousand, five hundred five".