55664571 has 4 divisors (see below), whose sum is σ = 74219432. Its totient is φ = 37109712.

The previous prime is 55664563. The next prime is 55664597. The reversal of 55664571 is 17546655.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55664571 - 2³ = 55664563 is a prime.

It is a super-2 number, since 2×55664571² = 6197088929228082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55664771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9277426 + ... + 9277431.

It is an arithmetic number, because the mean of its divisors is an integer number (18554858).

Almost surely, 2^55664571 is an apocalyptic number.

55664571 is a deficient number, since it is larger than the sum of its proper divisors (18554861).

55664571 is a wasteful number, since it uses less digits than its factorization.

55664571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18554860.

The product of its digits is 126000, while the sum is 39.

The square root of 55664571 is about 7460.8693193220. The cubic root of 55664571 is about 381.8208341756.

The spelling of 55664571 in words is "fifty-five million, six hundred sixty-four thousand, five hundred seventy-one".