1366878357285 has 128 divisors (see below), whose sum is σ = 2765007028224. Its totient is φ = 562776698880.

The previous prime is 1366878357277. The next prime is 1366878357323. The reversal of 1366878357285 is 5827538786631.

It is not a de Polignac number, because 1366878357285 - 2³ = 1366878357277 is a prime.

It is a super-2 number, since 2×1366878357285² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2523277 + ... + 3016733.

It is an arithmetic number, because the mean of its divisors is an integer number (21601617408).

Almost surely, 2^{1366878357285} is an apocalyptic number.

1366878357285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1366878357285 is an abundant number, since it is smaller than the sum of its proper divisors (1398128670939).

1366878357285 is a wasteful number, since it uses less digits than its factorization.

1366878357285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493563.

The product of its digits is 406425600, while the sum is 69.

The spelling of 1366878357285 in words is "one trillion, three hundred sixty-six billion, eight hundred seventy-eight million, three hundred fifty-seven thousand, two hundred eighty-five".