55665511 has 8 divisors (see below), whose sum is σ = 60886800. Its totient is φ = 50471040.

The previous prime is 55665509. The next prime is 55665523. The reversal of 55665511 is 11556655.

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

It is a cyclic number.

It is not a de Polignac number, because 55665511 - 2¹ = 55665509 is a prime.

It is a super-2 number, since 2×55665511² = 6197298229782242, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55665541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2226 + ... + 10783.

It is an arithmetic number, because the mean of its divisors is an integer number (7610850).

Almost surely, 2^55665511 is an apocalyptic number.

55665511 is a deficient number, since it is larger than the sum of its proper divisors (5221289).

55665511 is a wasteful number, since it uses less digits than its factorization.

55665511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13409.

The product of its digits is 22500, while the sum is 34.

The square root of 55665511 is about 7460.9323143961. The cubic root of 55665511 is about 381.8229834155.

It can be divided in two parts, 55 and 665511, that added together give a palindrome (665566).

The spelling of 55665511 in words is "fifty-five million, six hundred sixty-five thousand, five hundred eleven".