57666881 has 4 divisors (see below), whose sum is σ = 60702000. Its totient is φ = 54631764.

The previous prime is 57666863. The next prime is 57666883. The reversal of 57666881 is 18866675.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 57666881 - 2¹⁰ = 57665857 is a prime.

It is a super-2 number, since 2×57666881² = 6650938328536322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57666883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517531 + ... + 1517568.

It is an arithmetic number, because the mean of its divisors is an integer number (15175500).

Almost surely, 2^57666881 is an apocalyptic number.

It is an amenable number.

57666881 is a deficient number, since it is larger than the sum of its proper divisors (3035119).

57666881 is a wasteful number, since it uses less digits than its factorization.

57666881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035118.

The product of its digits is 483840, while the sum is 47.

The square root of 57666881 is about 7593.8712788669. The cubic root of 57666881 is about 386.3451703218.

The spelling of 57666881 in words is "fifty-seven million, six hundred sixty-six thousand, eight hundred eighty-one".