57661297839 has 24 divisors (see below), whose sum is σ = 85058391600. Its totient is φ = 37632566400.

The previous prime is 57661297787. The next prime is 57661297843. The reversal of 57661297839 is 93879216675.

57661297839 is a `hidden beast` number, since 5 + 7 + 6 + 612 + 9 + 7 + 8 + 3 + 9 = 666.

It is not a de Polignac number, because 57661297839 - 2⁹ = 57661297327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57661297739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275469 + ... + 437270.

It is an arithmetic number, because the mean of its divisors is an integer number (3544099650).

Almost surely, 2^57661297839 is an apocalyptic number.

57661297839 is a deficient number, since it is larger than the sum of its proper divisors (27397093761).

57661297839 is a wasteful number, since it uses less digits than its factorization.

57661297839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712935 (or 712932 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 57661297839 in words is "fifty-seven billion, six hundred sixty-one million, two hundred ninety-seven thousand, eight hundred thirty-nine".