1378520506517 has 16 divisors (see below), whose sum is σ = 1718714253312. Its totient is φ = 1074147238320.

The previous prime is 1378520506499. The next prime is 1378520506529. The reversal of 1378520506517 is 7156050258731.

It is a cyclic number.

It is not a de Polignac number, because 1378520506517 - 2⁶ = 1378520506453 is a prime.

It is a super-4 number, since 4×1378520506517⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378520506567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3648968 + ... + 4008990.

It is an arithmetic number, because the mean of its divisors is an integer number (107419640832).

Almost surely, 2^{1378520506517} is an apocalyptic number.

It is an amenable number.

1378520506517 is a deficient number, since it is larger than the sum of its proper divisors (340193746795).

1378520506517 is a wasteful number, since it uses less digits than its factorization.

1378520506517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409768.

The product of its (nonzero) digits is 1764000, while the sum is 50.

The spelling of 1378520506517 in words is "one trillion, three hundred seventy-eight billion, five hundred twenty million, five hundred six thousand, five hundred seventeen".