66515055 has 8 divisors (see below), whose sum is σ = 106424112. Its totient is φ = 35474688.

The previous prime is 66515051. The next prime is 66515063. The reversal of 66515055 is 55051566.

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

It is not a de Polignac number, because 66515055 - 2² = 66515051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66515051) 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, 2217154 + ... + 2217183.

It is an arithmetic number, because the mean of its divisors is an integer number (13303014).

Almost surely, 2^66515055 is an apocalyptic number.

66515055 is a deficient number, since it is larger than the sum of its proper divisors (39909057).

66515055 is a wasteful number, since it uses less digits than its factorization.

66515055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434345.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 66515055 is about 8155.6762441872. The cubic root of 66515055 is about 405.1725221394.

The spelling of 66515055 in words is "sixty-six million, five hundred fifteen thousand, fifty-five".