66552415 has 4 divisors (see below), whose sum is σ = 79862904. Its totient is φ = 53241928.

The previous prime is 66552407. The next prime is 66552427. The reversal of 66552415 is 51425566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51425566 = 2 ⋅25712783.

It is a cyclic number.

It is not a de Polignac number, because 66552415 - 2³ = 66552407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6655237 + ... + 6655246.

It is an arithmetic number, because the mean of its divisors is an integer number (19965726).

Almost surely, 2^66552415 is an apocalyptic number.

66552415 is a deficient number, since it is larger than the sum of its proper divisors (13310489).

66552415 is a wasteful number, since it uses less digits than its factorization.

66552415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13310488.

The product of its digits is 36000, while the sum is 34.

The square root of 66552415 is about 8157.9663519777. The cubic root of 66552415 is about 405.2483666843.

The spelling of 66552415 in words is "sixty-six million, five hundred fifty-two thousand, four hundred fifteen".