1377520365145 has 4 divisors (see below), whose sum is σ = 1653024438180. Its totient is φ = 1102016292112.

The previous prime is 1377520365107. The next prime is 1377520365149. The reversal of 1377520365145 is 5415630257731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 533303036176 + 844217328969 = 730276^2 + 918813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377520365145 - 2³⁵ = 1343160626777 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1377520365149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137752036510 + ... + 137752036519.

It is an arithmetic number, because the mean of its divisors is an integer number (413256109545).

Almost surely, 2^{1377520365145} is an apocalyptic number.

It is an amenable number.

1377520365145 is a deficient number, since it is larger than the sum of its proper divisors (275504073035).

1377520365145 is an equidigital number, since it uses as much as digits as its factorization.

1377520365145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275504073034.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 1377520365145 in words is "one trillion, three hundred seventy-seven billion, five hundred twenty million, three hundred sixty-five thousand, one hundred forty-five".