57663126781 has 8 divisors (see below), whose sum is σ = 62100713304. Its totient is φ = 53225820480.

The previous prime is 57663126779. The next prime is 57663126803. The reversal of 57663126781 is 18762136675.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21650473881 + 36012652900 = 147141^2 + 189770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57663126781 - 2¹ = 57663126779 is a prime.

It is a super-2 number, since 2×57663126781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57663126881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582555 + ... + 674311.

It is an arithmetic number, because the mean of its divisors is an integer number (7762589163).

Almost surely, 2^57663126781 is an apocalyptic number.

It is an amenable number.

57663126781 is a deficient number, since it is larger than the sum of its proper divisors (4437586523).

57663126781 is a wasteful number, since it uses less digits than its factorization.

57663126781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140111.

The product of its digits is 2540160, while the sum is 52.

The spelling of 57663126781 in words is "fifty-seven billion, six hundred sixty-three million, one hundred twenty-six thousand, seven hundred eighty-one".