66536415 has 24 divisors (see below), whose sum is σ = 125815248. Its totient is φ = 32259840.

The previous prime is 66536383. The next prime is 66536473. The reversal of 66536415 is 51463566.

66536415 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 641 + 5 = 666.

It is not a de Polignac number, because 66536415 - 2⁵ = 66536383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66536415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66714 + ... + 67703.

It is an arithmetic number, because the mean of its divisors is an integer number (5242302).

Almost surely, 2^66536415 is an apocalyptic number.

66536415 is a deficient number, since it is larger than the sum of its proper divisors (59278833).

66536415 is a wasteful number, since it uses less digits than its factorization.

66536415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134439 (or 134436 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66536415 is about 8156.9856564787. The cubic root of 66536415 is about 405.2158885564.

The spelling of 66536415 in words is "sixty-six million, five hundred thirty-six thousand, four hundred fifteen".