55821777712855 has 32 divisors (see below), whose sum is σ = 84068259867648. Its totient is φ = 34567540992000.

The previous prime is 55821777712843. The next prime is 55821777712871.

55821777712855 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55821777712855 - 2²¹ = 55821775615703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480046602 + ... + 480162871.

It is an arithmetic number, because the mean of its divisors is an integer number (2627133120864).

Almost surely, 2^{55821777712855} is an apocalyptic number.

55821777712855 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55821777712855 is a deficient number, since it is larger than the sum of its proper divisors (28246482154793).

55821777712855 is a wasteful number, since it uses less digits than its factorization.

55821777712855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960209647.

The product of its digits is 384160000, while the sum is 70.

The spelling of 55821777712855 in words is "fifty-five trillion, eight hundred twenty-one billion, seven hundred seventy-seven million, seven hundred twelve thousand, eight hundred fifty-five".