57123421806 has 96 divisors (see below), whose sum is σ = 129578206464. Its totient is φ = 16648339200.

The previous prime is 57123421799. The next prime is 57123421877. The reversal of 57123421806 is 60812432175.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10589446 + ... + 10594838.

It is an arithmetic number, because the mean of its divisors is an integer number (1349772984).

Almost surely, 2^57123421806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57123421806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64789103232).

57123421806 is an abundant number, since it is smaller than the sum of its proper divisors (72454784658).

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

57123421806 is a wasteful number, since it uses less digits than its factorization.

57123421806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5638 (or 5607 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 57123421806 in words is "fifty-seven billion, one hundred twenty-three million, four hundred twenty-one thousand, eight hundred six".