55283285865821 has 16 divisors (see below), whose sum is σ = 59888900111040. Its totient is φ = 51030068721840.

The previous prime is 55283285865803. The next prime is 55283285865881. The reversal of 55283285865821 is 12856858238255.

It is not a de Polignac number, because 55283285865821 - 2²² = 55283281671517 is a prime.

It is a super-2 number, since 2×55283285865821² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55283285865881) 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, 284394566 + ... + 284588888.

It is an arithmetic number, because the mean of its divisors is an integer number (3743056256940).

Almost surely, 2^{55283285865821} is an apocalyptic number.

It is an amenable number.

55283285865821 is a deficient number, since it is larger than the sum of its proper divisors (4605614245219).

55283285865821 is a wasteful number, since it uses less digits than its factorization.

55283285865821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323853 (or 323827 counting only the distinct ones).

The product of its digits is 368640000, while the sum is 68.

The spelling of 55283285865821 in words is "fifty-five trillion, two hundred eighty-three billion, two hundred eighty-five million, eight hundred sixty-five thousand, eight hundred twenty-one".