57561566 has 8 divisors (see below), whose sum is σ = 88676040. Its totient is φ = 28002888.

The previous prime is 57561557. The next prime is 57561589. The reversal of 57561566 is 66516575.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388856 + ... + 389003.

It is an arithmetic number, because the mean of its divisors is an integer number (11084505).

Almost surely, 2^57561566 is an apocalyptic number.

57561566 is a deficient number, since it is larger than the sum of its proper divisors (31114474).

57561566 is a wasteful number, since it uses less digits than its factorization.

57561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777898.

The product of its digits is 189000, while the sum is 41.

The square root of 57561566 is about 7586.9338998043. The cubic root of 57561566 is about 386.1098374638.

The spelling of 57561566 in words is "fifty-seven million, five hundred sixty-one thousand, five hundred sixty-six".