53557855866816 has 224 divisors, whose sum is σ = 169003434286080. Its totient is φ = 14635766390784.

The previous prime is 53557855866799. The next prime is 53557855866817. The reversal of 53557855866816 is 61866855875535.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53557855866817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432984370 + ... + 433108046.

Almost surely, 2^{53557855866816} is an apocalyptic number.

53557855866816 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 53557855866816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84501717143040).

53557855866816 is an abundant number, since it is smaller than the sum of its proper divisors (115445578419264).

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

53557855866816 is a wasteful number, since it uses less digits than its factorization.

53557855866816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137731 (or 137721 counting only the distinct ones).

The product of its digits is 7257600000, while the sum is 78.

The spelling of 53557855866816 in words is "fifty-three trillion, five hundred fifty-seven billion, eight hundred fifty-five million, eight hundred sixty-six thousand, eight hundred sixteen".