55066716 has 72 divisors (see below), whose sum is σ = 145613104. Its totient is φ = 18195840.

The previous prime is 55066709. The next prime is 55066717. The reversal of 55066716 is 61766055.

It is a happy number.

It is a super-2 number, since 2×55066716² = 6064686422049312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55066717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175776 + ... + 176088.

Almost surely, 2^55066716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55066716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72806552).

55066716 is an abundant number, since it is smaller than the sum of its proper divisors (90546388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55066716 is a wasteful number, since it uses less digits than its factorization.

55066716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 55066716 is about 7420.6951156883. The cubic root of 55066716 is about 380.4489522927.

The spelling of 55066716 in words is "fifty-five million, sixty-six thousand, seven hundred sixteen".