57721381356 has 24 divisors (see below), whose sum is σ = 134815423680. Its totient is φ = 19221574672.

The previous prime is 57721381337. The next prime is 57721381381. The reversal of 57721381356 is 65318312775.

It is a super-3 number, since 3×57721381356³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2347986 + ... + 2372441.

It is an arithmetic number, because the mean of its divisors is an integer number (5617309320).

Almost surely, 2^57721381356 is an apocalyptic number.

It is an amenable number.

57721381356 is an abundant number, since it is smaller than the sum of its proper divisors (77094042324).

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

57721381356 is a wasteful number, since it uses less digits than its factorization.

57721381356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721453 (or 4721451 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 48.

The spelling of 57721381356 in words is "fifty-seven billion, seven hundred twenty-one million, three hundred eighty-one thousand, three hundred fifty-six".