55757566 has 8 divisors (see below), whose sum is σ = 87272784. Its totient is φ = 26666640.

The previous prime is 55757563. The next prime is 55757591. The reversal of 55757566 is 66575755.

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

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 1212121 = 55757566 / (5 + 5 + 7 + 5 + 7 + 5 + 6 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55757563) 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, 606015 + ... + 606106.

It is an arithmetic number, because the mean of its divisors is an integer number (10909098).

Almost surely, 2^55757566 is an apocalyptic number.

55757566 is a deficient number, since it is larger than the sum of its proper divisors (31515218).

55757566 is a wasteful number, since it uses less digits than its factorization.

55757566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212146.

The product of its digits is 1102500, while the sum is 46.

The square root of 55757566 is about 7467.0989011798. The cubic root of 55757566 is about 382.0333432149.

55757566 divided by its sum of digits (46) gives a palindrome (1212121).

The spelling of 55757566 in words is "fifty-five million, seven hundred fifty-seven thousand, five hundred sixty-six".