57121063440 has 320 divisors, whose sum is σ = 213419673600. Its totient is φ = 12346048512.

The previous prime is 57121063423. The next prime is 57121063451. The reversal of 57121063440 is 4436012175.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21480831 + ... + 21483489.

It is an arithmetic number, because the mean of its divisors is an integer number (666936480).

Almost surely, 2^57121063440 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 57121063440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106709836800).

57121063440 is an abundant number, since it is smaller than the sum of its proper divisors (156298610160).

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

57121063440 is a wasteful number, since it uses less digits than its factorization.

57121063440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374 (or 3368 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 57121063440 in words is "fifty-seven billion, one hundred twenty-one million, sixty-three thousand, four hundred forty".