1377163665 has 12 divisors (see below), whose sum is σ = 2387083764. Its totient is φ = 734487264.

The previous prime is 1377163621. The next prime is 1377163703. The reversal of 1377163665 is 5663617731.

1377163665 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 1 + 636 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 828058176 + 549105489 = 28776^2 + 23433^2 .

It is not a de Polignac number, because 1377163665 - 2⁸ = 1377163409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 30603637 = 1377163665 / (1 + 3 + 7 + 7 + 1 + 6 + 3 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1377163665.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15301774 + ... + 15301863.

It is an arithmetic number, because the mean of its divisors is an integer number (198923647).

Almost surely, 2^1377163665 is an apocalyptic number.

1377163665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1377163665 is a deficient number, since it is larger than the sum of its proper divisors (1009920099).

1377163665 is a wasteful number, since it uses less digits than its factorization.

1377163665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30603648 (or 30603645 counting only the distinct ones).

The product of its digits is 476280, while the sum is 45.

The square root of 1377163665 is about 37110.1558202064. The cubic root of 1377163665 is about 1112.5730060241.

The spelling of 1377163665 in words is "one billion, three hundred seventy-seven million, one hundred sixty-three thousand, six hundred sixty-five".