49997561856 has 480 divisors, whose sum is σ = 159043153920. Its totient is φ = 13801881600.

The previous prime is 49997561849. The next prime is 49997561857. The reversal of 49997561856 is 65816579994.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49997561857) 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, 318455730 + ... + 318455886.

It is an arithmetic number, because the mean of its divisors is an integer number (331339904).

Almost surely, 2^49997561856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49997561856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79521576960).

49997561856 is an abundant number, since it is smaller than the sum of its proper divisors (109045592064).

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

49997561856 is a wasteful number, since it uses less digits than its factorization.

49997561856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 223 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 69.

The spelling of 49997561856 in words is "forty-nine billion, nine hundred ninety-seven million, five hundred sixty-one thousand, eight hundred fifty-six".