55821684231 has 12 divisors (see below), whose sum is σ = 80647388640. Its totient is φ = 37207040640.

The previous prime is 55821684209. The next prime is 55821684263. The reversal of 55821684231 is 13248612855.

55821684231 is a `hidden beast` number, since 5 + 5 + 8 + 216 + 8 + 423 + 1 = 666.

It is not a de Polignac number, because 55821684231 - 2⁶ = 55821684167 is a prime.

It is a super-2 number, since 2×55821684231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55821684631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 570090 + ... + 660791.

It is an arithmetic number, because the mean of its divisors is an integer number (6720615720).

Almost surely, 2^55821684231 is an apocalyptic number.

55821684231 is a deficient number, since it is larger than the sum of its proper divisors (24825704409).

55821684231 is a wasteful number, since it uses less digits than its factorization.

55821684231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235926 (or 1235923 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The spelling of 55821684231 in words is "fifty-five billion, eight hundred twenty-one million, six hundred eighty-four thousand, two hundred thirty-one".