55639700793656 has 128 divisors (see below), whose sum is σ = 125582064854400. Its totient is φ = 22615633797120.

The previous prime is 55639700793641. The next prime is 55639700793661. The reversal of 55639700793656 is 65639700793655.

It is a self number, because there is not a number n which added to its sum of digits gives 55639700793656.

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, 11166596 + ... + 15361388.

It is an arithmetic number, because the mean of its divisors is an integer number (981109881675).

Almost surely, 2^{55639700793656} is an apocalyptic number.

55639700793656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55639700793656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62791032427200).

55639700793656 is an abundant number, since it is smaller than the sum of its proper divisors (69942364060744).

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

55639700793656 is a wasteful number, since it uses less digits than its factorization.

55639700793656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195009 (or 4195005 counting only the distinct ones).

The product of its (nonzero) digits is 964467000, while the sum is 71.

Subtracting 55639700793656 from its reverse (65639700793655), we obtain a palindrome (9999999999999).

The spelling of 55639700793656 in words is "fifty-five trillion, six hundred thirty-nine billion, seven hundred million, seven hundred ninety-three thousand, six hundred fifty-six".