66682551 has 32 divisors (see below), whose sum is σ = 103783680. Its totient is φ = 37707264.

The previous prime is 66682501. The next prime is 66682559. The reversal of 66682551 is 15528666.

It is not a de Polignac number, because 66682551 - 2¹⁷ = 66551479 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66682559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27340 + ... + 29678.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^66682551 is an apocalyptic number.

66682551 is a deficient number, since it is larger than the sum of its proper divisors (37101129).

66682551 is a wasteful number, since it uses less digits than its factorization.

66682551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415.

The product of its digits is 86400, while the sum is 39.

The square root of 66682551 is about 8165.9384641326. The cubic root of 66682551 is about 405.5123343888.

The spelling of 66682551 in words is "sixty-six million, six hundred eighty-two thousand, five hundred fifty-one".