1326978165 has 16 divisors (see below), whose sum is σ = 2127722688. Its totient is φ = 706202496.

The previous prime is 1326978131. The next prime is 1326978173. The reversal of 1326978165 is 5618796231.

It is not a de Polignac number, because 1326978165 - 2¹¹ = 1326976117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87712 + ... + 101721.

It is an arithmetic number, because the mean of its divisors is an integer number (132982668).

Almost surely, 2^1326978165 is an apocalyptic number.

1326978165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1326978165 is a deficient number, since it is larger than the sum of its proper divisors (800744523).

1326978165 is a wasteful number, since it uses less digits than its factorization.

1326978165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189908.

The product of its digits is 544320, while the sum is 48.

The square root of 1326978165 is about 36427.7114982536. The cubic root of 1326978165 is about 1098.8909386523.

The spelling of 1326978165 in words is "one billion, three hundred twenty-six million, nine hundred seventy-eight thousand, one hundred sixty-five".