27755515811820 has 48 divisors (see below), whose sum is σ = 77720883982560. Its totient is φ = 7400952815616.

The previous prime is 27755515811729. The next prime is 27755515811827. The reversal of 27755515811820 is 2811851555772.

It is not an unprimeable number, because it can be changed into a prime (27755515811827) 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, 15324885 + ... + 17040044.

It is an arithmetic number, because the mean of its divisors is an integer number (1619185082970).

Almost surely, 2^{27755515811820} is an apocalyptic number.

27755515811820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27755515811820 is an abundant number, since it is smaller than the sum of its proper divisors (49965368170740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27755515811820 is a wasteful number, since it uses less digits than its factorization.

27755515811820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32379234 (or 32379232 counting only the distinct ones).

The product of its (nonzero) digits is 7840000, while the sum is 57.

The spelling of 27755515811820 in words is "twenty-seven trillion, seven hundred fifty-five billion, five hundred fifteen million, eight hundred eleven thousand, eight hundred twenty".