66412551 has 16 divisors (see below), whose sum is σ = 92150784. Its totient is φ = 42510624.

The previous prime is 66412547. The next prime is 66412559. The reversal of 66412551 is 15521466.

66412551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66412551 - 2² = 66412547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66412559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3030 + ... + 11916.

It is an arithmetic number, because the mean of its divisors is an integer number (5759424).

Almost surely, 2^66412551 is an apocalyptic number.

66412551 is a deficient number, since it is larger than the sum of its proper divisors (25738233).

66412551 is a wasteful number, since it uses less digits than its factorization.

66412551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990.

The product of its digits is 7200, while the sum is 30.

The square root of 66412551 is about 8149.3896090443. The cubic root of 66412551 is about 404.9642827822.

The spelling of 66412551 in words is "sixty-six million, four hundred twelve thousand, five hundred fifty-one".